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4 digit numbers

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Four digit numbers starting with 6 2020-04-22
Judy pose la question :
I need to generate a list of 4 digit numbers using 0-9 where the first digit is 6 and no numbers can be repeated
Penny Nom lui répond.
Some 4 digit numbers 2017-07-24
Camille pose la question :
I need all of the 4 digit combinations that starts with number 3 and digits can't be repeated
Penny Nom lui répond.
Four digit numbers 2016-09-08
ning pose la question :
0000-9999 there is ten thousand 4-digit numbers. How to find the number of ways that 4 digit are the same? How to prove it by using formula?
Penny Nom lui répond.
Some 4 digit numbers 2012-10-25
samira pose la question :
How many 4-digit numbers are there in which the first and last digits are the same?
Penny Nom lui répond.
Four digit numbers with no repeats 2010-01-02
Daniel pose la question :
I want to know how many different numbers there would be between the numbers 0000-9999 that do not have any numbers that duplicate or repeat in the number? For example the first number would have to be 0123 and the last would be 9876 (I think) Thanks!
Penny Nom lui répond.
Four-digit numbers 2009-04-11
jp pose la question :
How many four-digit numbers are there?
Penny Nom lui répond.
Choosing a 4 digit number at random 2009-03-24
shabkhal pose la question :
If a four-digit number is chosen at random, what is the probability that the product of the digits is 12.
Harley Weston lui répond.
Four digit combinations 2008-06-23
star pose la question :
Can you you give me a list of all 4 digit combination starting with the number 7, for example 7123,7213.
Penny Nom lui répond.
Four digit odd numbers 2007-09-26
sonia pose la question :
how many 4 digit odd numbers can be made using the digits 2, 5, 7, and 8
Penny Nom lui répond.
Four digit numbers 2007-07-30
Spence pose la question :
My son has a problem that he has been unable to figure out. I was asked to try, but I am confused on how to get the last two parts. Any help would be great.
Thanks
Spence

How many four-digit numbers can be formed under each condition?

A) The leading digit cannot be zero: 9(10)(10)(10)=9000

B) The leading digit cannot be zero and no repetition of digits allowed: 9(9)(8)(7)=4536

C) The leading difit cannot be zero and the number must be less than 5000: ??

D) The leading digit cannot be zero and the number must be even: ??

Penny Nom lui répond.
 
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