Question

How many ways can an IRS auditor select 3 of 11 tax returns for an audit

How many ways can an IRS auditor select 3 of 11 tax returns for an audit?
A)1331 B)6 C)990 D)165
My answer is: 990.
Is this correct?
Thanks.
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Answer #1
So would it be 165?
answered by: youu
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Answer #2
No it's not. You haven't considered the fact that the order in which he takes the audits doesn't matter. So e.g. the combination 1-2-5 would be the same as 5-1-2.
answered by: Shaz.E
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Answer #3
Correct.

He can choose from 11, 10 and 9 returns, which make 990 choices. As noted by Christiaan, the order is not important. So divide by 3! (for 3 returns) to make 990/6=165.
answered by: Den
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