mackiejade26 mackiejade26
  • 14-08-2019
  • Mathematics
contestada

How many ways can an IRS auditor select 5 of 12 tax returns for an audit?

Respuesta :

sqdancefan
sqdancefan sqdancefan
  • 14-08-2019

Answer:

  792

Step-by-step explanation:

The number of ways that k things can be chosen from a collection of n things is given by ...

  nCk = n!/(k!(n-k)!)

Here, we want the number of ways 5 items can be chosen from 12. That is ...

  12C5 = 12!/(5!·7!) = 12·11·10·9·8/(5·4·3·2·1) = 11·9·8

  12C5 = 792

There are 792 ways 5 returns can be chosen from 12.

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