SOLUTION: How many ways can an IRS auditor select 6 of 13 tax returns for an audit?

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Question 1165484: How many ways can an IRS auditor select 6 of 13 tax returns for an audit?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
this is 13C6 or 13!/6!7!
=1716