Math CentralQuandaries & Queries


Question from ning, a student:

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?

You want all the numbers in the ten thousand number list that are composed using the same four digits. You have listed two of them, 0000 and 9999. Two more are 1111 and 2222.

List them all and count how many there are.


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