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How many ways can an IRS auditor select 4 of 9 tax returns for an audit?

1 Answer

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The solution would be like this for this specific problem:

= C (9,4)
= 9! / (5! * 4!)
= 126
So, an IRS auditor can select 4 of 9 tax returns for an audit in as much as 126 ways.
User Jim Jin
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