#### Answer

$$\frac{9!}{6!\left(9-6\right)!}=84$$

#### Work Step by Step

We know the equation for combinations:
$$nC_r = \frac{n!}{r!\left(n-r\right)!}$$
Thus, we find:
$$\frac{9!}{6!\left(9-6\right)!}=84$$

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Published by
McDougal Littell

ISBN 10:
0618595414

ISBN 13:
978-0-61859-541-9

$$\frac{9!}{6!\left(9-6\right)!}=84$$

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