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How many five-digit numbers beginning in a 6 have exactly one pair of identical digits?

 May 31, 2020
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Can you have two sixes such as: 66123, or 60645, or 601246........etc? if so, I calculate that there are:

 

3,528 such numbers. If you are not allowed to have more than 1 six at the beginning such as: 612245, 60323,

 

65523......etc, then there are: 1,512 such numbers.

 Jun 1, 2020

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