Discrete Mathematics and Its Applications, Seventh Edition

Published by McGraw-Hill Education
ISBN 10: 0073383090
ISBN 13: 978-0-07338-309-5

Chapter 6 - Section 6.3 - Permutations and Combinations - Exercises - Page 413: 7



Work Step by Step

The number of 5-permutations of a set with nine elements = P(9, 5) [By definition] $=\frac{9!}{(9-5)!}$ $=\frac{9!}{4!}$ $=15120$
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