







Three digit codes 
20190714 

Jessica pose la question : I need to find the total number of 3 digit codes using the digits 1 through 9. How many of these codes would be odd numbers, and how many even? Penny Nom lui répond. 





A three digit code 
20190714 

Hannah pose la question : I have a briefcase with a threedigit code. I can set the code myself using digits 1 through 9, assuming that each digit can only be used once. How many possible codes are there? Penny Nom lui répond. 





4 digit codes 
20190227 

Sophia pose la question : How many 4 digit codes can you get out of a numbered key pad ? Penny Nom lui répond. 





A four digit pass code 
20180226 

Jessica pose la question : I was trying to fond out how many combinations could there be for a four digit pass code to a phone when no numbers are repeated? Penny Nom lui répond. 





The code on a new phone 
20180202 

Maria pose la question : Hi 
My husband gave me a new Samsung Galaxy mobile for out anniversaire gift. He set me a challenge which I have to solve before I can use the Phone. He has set the pin code with numbers 4, 7 and 0 and created a four digit code with the said numbers. Is there a way I can somehow list all possible combinations and try them all? Thanks! Penny Nom lui répond. 





4 digit codes with repeating digits 
20170601 

Morgan pose la question : what are all possible 4 digit code repeating numbers? cuz i know that you have one website on it but, it doesn't repeat 2 numbers in a code. Harley lui répond. 





A lost iPhone pass code 
20170417 

Sam pose la question : I have a locked iPhone and it has all my of my holiday photos on it. I changed the password and then I think I did a incorrect number pattern but anyway I know it ends with 99 and the first 4 digits are 235 and 6 could you please send all of the combinations for this password (without the 99) Thx and plz get back ASAP I need it for school Penny Nom lui répond. 





A six digit code 
20160506 

Ralph pose la question : How many combinations are possible if a "safe" has four buttons and you can use a six digit code? (these are just single press buttons..)For example, this could be one possible combination: Button 4 Button 1 Button 1 Button 3 Button 2 Button 4. Thanks! Penny Nom lui répond. 





A fivedigit pass code 
20150425 

Mary pose la question :
Question from Mary:
More on your published question:
I have the same type of lock, but set up a 5digit pass code. Is that more or fewer possibilities than a 4digit code. How many digits would make the lock most secure? I don't believe Werner specified this, but each number can only be used once. Thanks, Mary Penny Nom lui répond. 





A 4 digit code 
20130326 

chris pose la question : I saw a previous question about a 4 digit code type thing and I was wondering if you could email me that same type of thing.
I changed the pin number on my phone's lock screen and I tried hard to remember it, then I had to go help my mom with something and I automatically forgot it and there is no way for me to get back on my phone.
I need all of the possible 4 digit number combinations without the numbers 0, 1, or 2. It cannot be repeating, ascending, or descending.
I know you may not want to do all of them, but I really need it. Robert Dawson lui répond. 





A valid UPC number 
20121222 

Jacob pose la question : A valid UPC number , ABABABABAB C must end in a 2 after using the rule: 3A +B+3A+B+3A+B+3A+B+3A+B+C=##2. What would term C need to be in order to make the following UPC valid? 2741825293C Harley Weston lui répond. 





A security code 
20120901 

Breanna pose la question : The code is made up of five two digit numbers from 01 to 20 entered in a certain order. How many different security codes are possible with this system Penny Nom lui répond. 





A punchcode lock box 
20101129 

Doug pose la question : I am a real estate agent that uses punchcode 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 09
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. 





My phone is "sim locked" 
20100610 

Daniel pose la question : Question from daniel:
got a phone that says sim locked, it requires 09 digit code to get in, how many combinations could there be if you could please list the possibilities, the number can be repeated. Penny Nom lui répond. 





A three digit entry code 
20100414 

Bryon pose la question : The entry code for the executive bathroom is a threedigit odd number
with no repeated digits. If you want to try to break in, what is the
maximum number of numbers you'll have to try?
(Remember that the threedigit numbers cannot start with zero.) Stephen La Rocque and Penny Nom lui répond. 





A code on my pedometer 
20100219 

Jacqui pose la question : Hi I need to break a code on my pedometer. I have only 3 digits 1 2 and 3 but need to fill a 5 digit code. I have tried to find answers but they seem to relate to if the digits are only used once. I can use them in any order and repeated as many times. How many possibilities are there and is there an easy way to run through them. Many thanks Tyler Wood lui répond. 





A 4digit phone code 
20100121 

pat pose la question : my daughter can`t remember her 4digit code to unlock her phone. she is pretty sure it starts with a 4. can you help us? my brain is locked up Robert Dawson lui répond. 





A four digit passcode 
20090112 

john pose la question : i have a machine at home that has a four digit passcode and the numbers range from 1 to 4 how can i get all the ways those numbers can be used Harley Weston lui répond. 





Zip codes, postal codes and 5 digit codes 
20080708 

Mike pose la question : Sorry if you have answered this before but I don't understand the explanations I have seen.
How many possible combinations are in a 5 digit code (like a Zip Code). Is there an equation that can be used for this type of question? Penny Nom lui répond. 





Break this code 
20080416 

Kim pose la question : The most common letter used in the English Language is E. The next is T. Vowels O,A and I are the next most common;then comes the letter N.
Use this information to break this code.
DMRA EXCEFX GC RCQ JRCL QBMQ QBX NQOGA CS DMQBXDMQTUN UMR BXFE QBXD WXMG CW LWTQX M UCGX Claude Tardif lui répond. 





A 4 digit passcode 
20080216 

Rob pose la question : If there is a 4 digit passcode with only 6 punch in symbols, how many possibilities are there and what are they?
symbols are: Y, X, RB, RT, LB, LT. Please get back to me, thanks for your time and help. Stephen La Rocque lui répond. 





Zip codes 
20071203 

Natalie pose la question : How many 5 digits zip codes are possible if digits can be repeated? Penny Nom lui répond. 





How many three button codes are possible? 
20070823 

kim pose la question : A home security device has ten buttons and is disarmed by pushing three buttons in sequence. How many three button codes are possible if each button can be pushed more than once in the code? Stephen la Rocque lui répond. 





I need all the possible 4 digit combinations... 
20070718 

Jo pose la question : I have lost the code for my car stereo. I need all the possible 4 digit combinations using the numerals 1 2 3 4 5 and 6. Thank you Penny Nom lui répond. 





Five button push lock 
20070706 

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. 





A 4digit access code 
20050102 

Missi pose la question : I need to find the 4 digit number to access my voice mail. These numbers will be 09 & 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. 





A zip code problem 
20001026 

Rob Mathis pose la question : Find the zip code of a place in a county so that the product of it and the zip code of another place in another county of the same name, but in a different state, is an exact multiple of the number 123456789 Claude Tardif lui répond. 

