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.
4 answers
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.
So would it be 165?
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.
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.
How do I show this math problem 990
Divided by 6.
Divided by 6.
2 answers