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	A lock combination		2022-07-19
		Kendal pose la question : If I tried I could probably (I think) figure the answer but it would take a minute and I hoped maybe as math people there may be a simple formula… I just watched a new movie Black Phone, the kid is given 5 numbers for a combination lock in order but with no indication where the stops are. The numbers (in order) are 23317, my question is how many possibilities with a standard combination lock are there…ie. 2-33-17, 23-3-17, 23-31-7…. As you can imagine not a great movie…my curiosity may get the best of me depending on how your app works ;). Thanks for your time. Penny Nom lui répond.
	A combination lock		2020-09-29
		Rourke pose la question : how many possible combinations are there in a 4 digit lock with 6 numbers which can repeat themselves. Penny Nom lui répond.
	4 digits to unlock a padlock		2020-08-28
		Sophie pose la question : I have forgotten the order in what the numbers go for my padlock! The numbers are, 0125, they don't have any repeats like, 0001, 0002. What are all possible the combinations? Help! Penny Nom lui répond.
	A combination lock		2019-08-01
		markbo pose la question : A combination lock has 0-9 plus Y on its keypad. A code is generated by selecting 4 digits from those keys (0-9 and Y) with no repeated choices, but sequence does not matter (i.e. 1-2-3-4 is the same as 4-3-2-1, and the same as 3-4-1-2 and counts as one combination) How many different 4-digit codes are possible in this scenario? Penny Nom lui répond.
	Combination lock		2019-07-31
		Antony pose la question : Hello. So my 3yr old daughter has had a bit of a play with the 3 dial combination lock on my backpack and locked it closed. I am looking for all the possible combinations to go through a process of elimination to find the combination she has set. To be clear. There are three dials, each with the numbers 0-9. I have read 10x10x10=1000 options but not sure if that is correct .. feels too small? Many thanks in advance. Penny Nom lui répond.
	An inline lock with four rows		2019-06-05
		Edward pose la question : I have a inline lock with four rows of numbers 0-9.The numbers cannot be repeated. Can you please print the possible codes so I can go through them one at a time. The lock and the cable cost $300. Don't want to pitch it. You guys are lifesavers, can't wait to hear back. Thanks. Penny Nom lui répond.
	A 4 digit combination lock		2019-02-02
		Brijanshu pose la question : I have a lock that contain only four no. 6,7,8 & 9 . How many possible password of four digit containing these Number. Penny Nom lui répond.
	When are the hands of a clock perpendicular?		2018-01-11
		Nazrul pose la question : How many times in a day are the hands of a clock perpendicular to each other? How can I find the times? Please help me. Penny Nom lui répond.
	A lock with 3 tumblers		2017-07-29
		Carol pose la question : I have a lock that has 3 tumblers. The numbers are 0 - 9. I cannot recall what I set the combination to. How many combinations will there be with three numbers? Penny Nom lui répond.
	Filling cinder blocks with concrete		2017-04-24
		Katherine pose la question : I am looking to construct a 10 X 10 dance floor using 8 x 16 cinder blocks. I have figured that I will need about 120 blocks, however I am not sure how much concrete I will need to fill the total empty space. Thank you Penny Nom lui répond.
	A block base for a plywood rectangle		2017-02-18
		Joe pose la question : How many cinder blocks 16x8 would i need to build a solid base for a plywood base 54inches wide and 30 inches deep Thank you Penny Nom lui répond.
	The area of a city block		2016-12-08
		Miura pose la question : A city block is three times as long as long as it is wide.if the distance around the block is 0.48 kilometers, what is the area of the block in square meters? Penny Nom lui répond.
	A key for a lock with five tumblers		2016-11-02
		Aeriel pose la question : A lock works by having a key turn a sequence of tumblers. Consecutive tumblers have different heights, and in order to unlock the lock, the sequence of heights on the key must exactly match those of the lock. The picture below shows a lock with four tumblers. How many different keys can be made for a lock that has 7 tumblers with 5 possible heights each? Penny Nom lui répond.
	A block wall		2016-03-15
		Robert pose la question : I have a wall 40 ft. long and 4 ft. tall as well as another one that is 30 ft by 3.5 ft. tall that I am trying to build. how many 6 inch by 12 inch landscaping blocks do I need? Penny Nom lui répond.
	Compressed Earth blocks		2016-03-02
		John pose la question : how many 14"x10"x4" blocks do I need for a 1300sq foot house 8 foot high Penny Nom lui répond.
	The combination to a locker		2015-11-11
		Jason pose la question : Hi, I can't seem to open my locker cause I forgot the combination, the numbers are 1-8 Without repeat for 4 number for example 1234 or 2345 for numbers 1-8 without any repeat. Harley Weston lui répond.
	The weight of a steel block		2015-04-04
		Mark pose la question : the weight of a steel cube 37 inches X 28 inches X 7 inches Penny Nom lui répond.
	A lost combination		2014-09-28
		Kim pose la question : I cannot remember my combo to this simple lockbox. It is 3 digits- from 0-9. They can be used more than once . I thought it was 117..but no joy. I am fairly sure it was using those digits 1, and 7. can you give me a list of all possible combinations, using 1s and 7s, for the 3 number code? Thank you and I am in awe of people who have math skills, for I certainly do not. Penny Nom lui répond.
	Three digit padlock combinations		2014-03-20
		Edwin pose la question : Would appreciate if you can provide me with the list of different combinations that can be obtained from a three digits number. I lost the access code of a three digits number padlock (and need to open it order to get important documents Penny Nom lui répond.
	An extension using concrete blocks		2013-10-30
		david pose la question : hi how many concrete blocks would i need for an extension 50 ft long ,20 ft wide and 12ft height Penny Nom lui répond.
	A 4 digit phone lock using the digits 4, 2, 3 and 0		2012-12-24
		Ragu pose la question : I would like to know formula for searching a combination of 4 digit. eg. I knew my Phone Lock combination is my car plate number 4230. But this time, i used another way around instead of 4230. But I am sure, there is only this 4 digits only. 4 & 2 & 3 & 0 Penny Nom lui répond.
	A clock takes 3 seconds to strick the hour of 3 o'clock		2012-03-09
		saptarshi pose la question : [ A clock takes 3 seconds to strick the hour of 3 o'clock. How many seconds will it take to strick 9 o'clock?] Robert Dawson lui répond.
	A lost combination		2012-03-06
		pam pose la question : I lost the combination for my luggage that I haven't used for many years. It is a 3 digit combination. I'm pretty sure only these numbers could have been used: 0,1,2,3,7,8,9. Can you give me a calculated list of all these combinations? Penny Nom lui répond.
	Tiling a floor		2012-02-27
		jamie pose la question : how many 16in by 16in blocks would it take to cover a 16ft by 16ft floor? Penny Nom lui répond.
	Blocks in a wall		2011-09-12
		JOHN pose la question : HOW MANY BLOCK WILL IT TAKE TO BUILD A 28*48 HOME, ON A FOOTER THAT IS DONE ALREADY, I WANT TO GO TEN HIGH. Harley Weston lui répond.
	A lock box		2011-08-03
		Tom pose la question : I need to open a lock box from my parent's estate. The combination is a simple 4 number lock. The last two numbers are 33. Numbers can be used more than once.What are the possible combinations? WP Harley Weston lui répond.
	A punch-code lock box		2010-11-29
		Doug pose la question : I am a real estate agent that uses punch-code lock boxes on houses to store the keys. I need to crack the code on one of our boxes, so I need a list of the possible combinations. Rules: 4 digit code Numbers 0-9 Each number can only be used once Order of the numbers does not matter. With advice from this site, I have calculated that there should be 210 possibilities. 10x9x8x7 (5040) gives me the total number possibilities and 4x3x2x1 (24) gives me the total number of ways to arrange those numbers. So if I divide the possibilities by the arrangement, I get 210. (5040 / 24 = 210) GREAT!!! Now, how do I develop a list of those 210 combinations? Thanks for your help. Robert Dawson lui répond.
	The equation of a circle		2010-10-20
		Silvan pose la question : Hi, I just want to find the x,y values for the circumference of a circle... Lets take a clock having its centre at (0,0) in a graph. I just want to know how to find the (x,y) co-ordinates for the curved path or the surface of the circle.. Is there any formula to directly align the curved path or the circumference of the circle in a graph for a known radius of a circle.. I feel it will be useful for me to draw a clock in a graph... :-) Penny Nom lui répond.
	The distance travelled by a minute hand		2010-03-06
		Patric pose la question : How much distance will the minutes hand of length 14mm of a clock cover in moving from 5 to 10? Penny Nom lui répond.
	A push-button padlock		2010-01-17
		Vince pose la question : Hi, I have a push-button padlock using ten buttons (1-2-3-4-5-6-7-8-9-0). Five digits must be pushed in order to open the lock. Each digit can only be used once. Order is not supposed to matter. How many different possible combinations? And what are they? Harley Weston lui répond.
	Unlocking my suitcase		2009-08-21
		Jamboree pose la question : I need to have all the possible combination of three digit between 0-9, i have seen the answer that there are 720 combination are there. Could you please show me all those combination numbers so that i could try it out to unlock my suitcase, will you please write it down all those combination and send it to me Victoria West lui répond.
	Number of Concrete Blocks		2009-08-06
		Simone pose la question : Hi there, I have a quote to complete and I need to figure out the formula that will tell me how many concrete blocks I need to cover a certain area. Blocks can either be 8in or 12in. The area that I am looking to cover with blocks is 30182 sq ft. Thank you for your assistance. Janice Cotcher and Stephen La Rocque lui répond.
	A 5 digit push combination lock		2009-04-04
		Andrew pose la question : I have a 5 digit push combo lock that i forgot the combo for. it has numbers 1-4 and each number can be pressed more then once ie. 11111, 36356 is there an algorithm out there that will list out the possible combinations for me? or maybe a way i could write them out myself. Penny Nom lui répond.
	My son has locked his ipod and can't remember the combo.		2009-03-27
		peggy pose la question : my son has locked his ipod and can't remember the combo. He knows it has the numbers 2-5-8 in it but not the fourth number or the order. could you help us? Robert Dawson lui répond.
	I lost the combo to my lock box		2009-01-10
		Rob pose la question : I lost the combo to my lock box, I remember 2 of the #'s in the combo are 6, but dont remember which ones. What are the possible scenarios knowing the above? Thanks! Stephen La Rocque lui répond.
	Percentage of an hour		2008-10-15
		JESSICA pose la question : HI I AM IN GRADE 7 AND FOR MATH HOMEWORK MY TEACHER ASKED US TO MAKE 8 DIFFERENT TIMES(clocks) AND TELL HIM WHAT THE PERCENTAGE FOR THE TIME IS. BUT I DON'T KNOW HOW TO CONVERT TIME TO A PERCENT. PLEASE HELP ME??!!?? JESSICA SEVENTH GRADE Penny Nom lui répond.
	A three 0-9 tumbler lock		2008-09-22
		Louis pose la question : I recently gave my daughter an old briefcase which uses a three 0-9 tumbler lock. She set the lock and now she can’t open one side. Q. Is there a 3 digit combination number generator available to give me the 1000 possibilities? Thanks, Lou PS In this type of lock you can repeat the same digit three times. Penny Nom lui répond.
	How many city blocks in a mile?		2008-08-14
		DARLENE pose la question : HOW MANY CITY BLOCKS EQUAL 1 MILE IN BIRMINGHAM, AL? Penny Nom lui répond.
	Concrete blocks		2008-06-18
		marvin pose la question : How many cement blocks do i need to build a 8 ft. tall wall x 1,300 ft. long? Harley Weston lui répond.
	The angle between the hands on a clock		2008-04-04
		Kristin pose la question : The question I need help with is : Bobo looked at the clock at 1:25. What was the precise measure of the angle formed by the hour and minute hands of the clock? Assume that each of the clock hands moves at a constant rate continuously around the face of the clock. Thus, in any given fractional part of an hour, each hand will move that same fractional part of an hour's worth of movement. Stephen La Rocque lui répond.
	A briefcase lock		2008-02-11
		Alfred pose la question : A briefcase lock has 3 columns of numbers each 0-9. It opens with the correct combination of three numbers. How many combinations are possible to open the lock. Penny Nom lui répond.
	A 24 hour clock		2008-01-31
		CARLA pose la question : at a certain time i looked at a 24-hour digital clock and noticed some things about the time. (1 The number in the hours section plus the number in the minutes section makes 60.(2 One of the digits in the minutes section is the square root of the other digit in the minutes section.(3 The sum of the digits in the minutes section is the number in the hours section reversed. what is the time? Penny Nom lui répond.
	A 5 button lock		2008-01-02
		mandy pose la question : i have a problem. I have a 5 button lock.and i seem to have forgotten the combination. You can only push each button once but you can push more than one button at a time and you don't have to use each button but i am pretty sure i used all five. for example it can be 1,2,3,4,5 or 1,2&3,4,5. I was wondering if anyone can get me a list of all the possibilities because i really need to get the box open. Penny Nom lui répond.
	Partitioning a clock face		2007-12-19
		Kim pose la question : Using a clock with a regular circular faced dial, draw two straight lines such that the sum of the numbers in each of the three areas is equal. The team at Math Central lui répond.
	A 3 digit lock		2007-11-06
		Michael pose la question : We have a 3 digit lock that only allows for 5 possible numbers to be used. (The numbers can repeat) What are the total number of combinations that can be created. Penny Nom lui répond.
	The digital lock for a cell phone		2007-08-29
		Hollie pose la question : i have a four digit lock code on my cell phone and cannot remember what it is. i know that it does not contain a 2 or a 4 and none of the numbers are repeated. the numbers range from 0 to nine and the only way to figure out what the code is, is to try randomly. I was wondering if you could give me a list of possible combinations using the information i gave you to make it easier to crack the code. Penny Nom lui répond.
	An old bike lock		2007-08-08
		Jeremy pose la question : I have an old bike lock i found in the garage of the house i just moved in to. It has four columns and the nubers are 1 through 6. I understand that there are 1236 (6x6x6x6) possibilities. Is there a graph of all the possible combinations cuz i looked all over the web and couldn't find one. Penny Nom lui répond.
	Five button push lock		2007-07-06
		Jeffrey pose la question : We have a 5 button push lock and we were wondering how many different codes were possible in this situation. In this lock each button can only be pressed once (ie it's not a numbered key pad) and order matters. How would we find out the # of possible codes? Stephen La Rocque lui répond.
	The combintion of a bike lock		2007-07-01
		Tricia pose la question : I have a bike lock that I know the numbers 3, 6, 8, & 9 are part of the combination, but I can't remember the order. What is the calculation to get all of the possible combinations. Stephen La Rocque lui répond.
	The lock code for my phone		2007-06-30
		Amanda pose la question : okay so i forgot my lock code for my phone its four digits but i know it doesn't have a 1 or a 0 in it so it has to be from numbers 2 to 9 i need to know all the four digit combinations asap cause i cant use my phone till can someone please help me Amanda Penny Nom lui répond.
	Rate of change of distance between the clock hands		2007-06-05
		Jonathan pose la question : A certain Clock has a minute hand with a length of 4 inches long and an hour hand with a length of 3 inches long. How fast is the distance between tips of these hands changing at 9:00? Stephen La Rocque lui répond.
	A push button lock		2007-05-21
		Werner pose la question : I have a push button lock (the numbers entered does not have a start and end i.e. 1234 = 4321 or 2341 = 3241 ...) So if it is a 4 digit code and you have 10 buttons (0 to 9) there should be 5040 (?) possibilities and how would I list these unique combinations Penny Nom lui répond.
	4 digit lock		2007-05-16
		Kathy pose la question : Hi, My name is Kathy and I'm a REALTOR, I have 2 different lockboxes that I cannot remember the combinations for, so what I need is all the different combinations for 4 digits that cannot be the same, i.e. 0123. Can you help me out? I would hate to throw them away as they cost about $30 each. Thank you, Kathy Stephen La Rocque lui répond.
	Understanding fractions and their equivalents		2007-04-02
		Gail pose la question : How can I get fourth grade students to understand fractions and their equivalents? Diane Hanson lui répond.
	Angle of clock hands		2007-01-31
		Sophia pose la question : How many degrees are in the aute angle formed by the hands of a clock at 2:20 p.m.? Stephen La Rocque lui répond.
	Bike combination lock		2006-07-16
		Alejandra pose la question : I have a bike lock. It has three columns of the digets 1-9 and zero. I have forgotten the combination. Three numbers need to be imputed. What are the possible lock cominations, so that i can try to break the lock? Stephen La Rocque lui répond.
	A 5 digit, push-button door		2006-06-20
		George pose la question : We have a 5 digit, push-button door look (1-5). How many combinations are possible without repeating a number in a 3 digit entry code? Stephen La Rocque lui répond.
	A 4-digit Combination Lock		2006-03-09
		Adam pose la question : I have a 4-digit Combination Lock but i have forgotten the code. i do know that it is an even number, all the digits are different, the second digit is zero and the largest digit is 6. what are all the possibilities. Stephen La Rocque lui répond.
	A 3 by 3 block on a calendar		2006-01-18
		A student pose la question : Choose two different blocks of nine numbers arranged 3 across and 3 down on a calendar, and check that this rule holds: For any block of nine numbers the average of the four corner numbers is equal to the middle number. Show your work and explain why the rule works. Penny Nom lui répond.
	Blocks in a mile in Phoenix Arizona		2005-11-30
		Rita pose la question : How many blocks are there in a mile in our city of Phoenix, Az.? Penny Nom lui répond.
	A combination lock		2005-10-03
		A bicycle owner pose la question : What are the number of permutations (Combinations?) of a combination lock of a cylinder with four separate movable rings. Each ring has the numbers from one to six (six "permutations" per ring). This is a bicycle lock. I was told that it is 62 (6x6x6x6) = 1296. Is this correct?. Penny Nom lui répond.
	A combination lock has 60 positions...		2005-02-07
		Kathy pose la question : A combination lock has 60 positions arranged in a circle to which a pointer may be set. Three settings are required to open it and no one setting may be closer than 5 positions from the immediately preceding setting. How many different locks may be manufactured? Penny Nom lui répond.
	A 4-digit access code		2005-01-02
		Missi pose la question : I need to find the 4 digit number to access my voice mail. These numbers will be 0-9 & numbers can be repeated. Could you provide me with a list of possibly combinations? If not, do you know anywhere that I could get a list of combinations so I don't have to write it all down? Harley Weston lui répond.
	Safe cracker		2004-09-09
		Adam pose la question : Franklin's friend had taken an item from him, and put it in his family's safe, when franklin went to retrieve it he came to a combination lock on the safe, with the dial numbers going from 0 to 59. Unfortunately, he wasn't sure whether there were three or four numbers in the combination, or even which direction to turn the wheel If it takes him 15 seconds to try a single combination, how many days will it take him to to try every possible combination? Please round to the nearest day. Penny Nom lui répond.
	The number of blocks in a mile		2004-07-18
		Valerie pose la question : I don't know if you can help me but I was wondering how many blocks are in a mile in Ocean City, New Jersey? Penny Nom lui répond.
	The combinatiion for a keybox		2004-05-17
		Darrin pose la question : I have a puzzle question based on reality. I have a real-estate type keybox (Supra) that has 10 digits, 0-9. I am trying to figure out a methodical way to test all number combinations to it to open it. (totally legal- it was taken from the trash at a jobsite since they couldn't open it!) The combination could be any or all of the digits, but any digit is only used once. This is not like a simplex lock problem where a combination of keypresses would be different- i.e. 1,2,3 is the same as 1+2,3. Any ideas? Penny Nom lui répond.
	Why the word combinations?		2004-05-05
		Megan pose la question : Why are locker combinations called locker combinations not locker permutations. The order of the numbers matter so why aren't they called locker permutations. Claude Tardif and Penny Nom lui répond.
	A clock chimes 7 times in 7seconds		2004-05-02
		Anna pose la question : A clock chimes 7 times in 7seconds. how long does it take the clock to chime 10 times? Penny Nom lui répond.
	Transformations of pattern blocks		2003-02-06
		Cheryl pose la question : I am trying to help my 8th grade son with Transformations - use of patttern blocks. He has to trace a figure and reflect it across the x-axis, which I can do, but then it indicates include ordered pairs - that confuses me. Penny Nom lui répond.
	10 hours before 7:15		2002-10-27
		Jessica pose la question : It is evening 7:15. What time would it be 10 hours earlier? Penny Nom lui répond.
	Sanding a wooden block		2002-09-07
		Wanda pose la question : If a wooden block, 2in height, 3in width, and 6in length is sanded and 1/8 of an inch is removed from the top and from the bottom, how much is the volume of the block decreased? Penny Nom lui répond.
	Combination locks		2002-08-17
		John pose la question : How many combinations of three number codes can occur with a standard combination lock? The range of possible numbers is 0-39 which allows 40 different possible choices each turn of the dial. Each combination requires exactly three numbers (i.e. three turns of the dial). E.g. 35-40-5. Allow for reuse of the same number three times e.g.10-10-10. I don't think there is any preference shown for certain number combinations. Can you explain how the total is derived? Someone at the YMCA this week put this question to me and I gave an answer but I am not sure I am right--so I have come to you. Penny Nom lui répond.
	Combinations?		2002-03-16
		Sara pose la question : A combination lock has three dials numbered 0 - 9. Give a mathematical reason why "combination" is a bad name for this type of lock. Penny Nom and Chris Fisher lui répond.
	Counterclockwise		2001-09-14
		Rolanda pose la question : When Descartes invented the coordinate system he decided to number them counter-clockwise. Why? Chris Fisher lui répond.
	A combination lock		2001-04-05
		Ken pose la question : What is total number of combinations possible on a combination lock which contains 3 wheels each numbered 0-9? Penny Nom lui répond.
	When did the man go out?		2000-12-14
		Rajesh pose la question : A man goes out in time between 5 and 6 and when he comes back he observes that two hands have interchanged position. Find when the man did go out? Penny Nom lui répond.
	Three problems		2000-12-14
		Sarah pose la question : Hi, my name is Sarah, and I'm asking this question on behalf of niece who is in secondary two. Thank you. Q1. What is the angle formed by the hour hand and the minute hand of a 12 hour clock at 5.50pm. . . . Penny Nom lui répond.
	Why counterclockwise?		2000-02-21
		Drew pose la question : Why do the numbers of quadrants in a graph increase in a counter clockwise pattern? Why aren't they numbered increasingly in a clockwise pattern? Chris Fisher lui répond.
	The number of city blocks in a country mile		1999-11-24
		Gloria Hearst pose la question : For years my family has had an on going debate on the number of city blocks in a country mile. We vary from a minmum 8 blocks per mile to a maximum of 12 blocks per mile. Nadine Griffiths and Penny Nom lui répond.
	A goofy clock		1999-11-20
		Kate pose la question : While repairing a watch, a jeweler removed the hands and inadvertently replaced the hour hand on the min. spindle and vice versa. he set the hands to read 2:00pm, which was the correct local time when I picked up the watch. A few minutes later, I noticed that the hands were taking goofy positions. What was the first time thereafter that the watch would show the correct local time? Chris Fisher lui répond.
	Clockwise or Counterclockwise?		1999-10-27
		Tim pose la question : A particle moves around the circle x2 + y2 = 1 with an x-velocity component dx/dt = y Find dy/dt Does the particle travel clockwise or counterclockwise around the circle? Why? Harley Weston lui répond.
	Modular Arithmetic		1999-02-04
		Leslie Kupper pose la question : I am trying to do a project on modular arithmetic. I was wondering if there were any websites that include a sample lesson plan on modular arithmetic for any grade level. Let me know where and how to find them. Thanks. Harley Weston lui répond.
	Geometry patterns lesson plans		1998-12-31
		Vicki pose la question : hi,,, my name is Vicki and I am a new 5th grade teacher.... Anyway, I'm supposed to come up with a lesson plan to Explore patterns that result from cominations of "reflections, rotations, and translations of geometric figures. The plan is to include: writing/metacognition, assessment strategies, interdisciplanary connections, supplemental materials, or textbook, and Bloom's taxonomy level. Any help you could give would be greatly appreciated. Thanks Jack LeSage lui répond.
	Students and Lockers		1998-10-02
		Mike pose la question : There is a row of 1000 lockers. There is a line of 1000 students. Student number 1 starts at the first locker and opens all 1000. Student number 2 starts at the second locker and closes every other one. Student number 3 starts at the third locker and goes to every third one, closing the open ones and opening the closed ones. Student number 4 does the same with every fourth locker and so on down the line... After all 1000 students have gone how many lockers are open and which ones are they? Please help! There is proboly a simple solution but we couldnt figure it out for the life of us. Please let us know how you solve it. Patrick Maidorn and Penny Nom lui répond.
	Hour Hand Movement		1998-04-19
		Chris and Angela Bradley pose la question : My wife and I are haveing an argument over the answer to this question, what is the total number of degrees through which the hour hand of the clock moves in 3 hours and 18 minutes? Thanks in advance. Chris Fisher lui répond.
	Clock Arithmetic.		1998-03-09
		Joann Dixon pose la question : What is clock mathematics? Patrick Maidorn lui répond.

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