Answer
504
Work Step by Step
We know the following equation for permutations:
$$nP_r=\frac{n!}{(n-r)!}$$
Thus, we find:
$$\frac{9!}{\left(9-3\right)!}=504$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 12 Sequences and Series - Cumulative Review - Page 848: 24
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