#### Answer

840

#### Work Step by Step

We know the following equation for permutations:
$$nP_r=\frac{n!}{(n-r)!}$$
Thus, we find:
$$\frac{7!}{\left(7-4\right)!}=840$$

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Published by
McDougal Littell

ISBN 10:
0618595414

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

840

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