Answer
15120
Work Step by Step
The number of 5-permutations of a set with nine elements = P(9, 5) [By definition]
$=\frac{9!}{(9-5)!}$
$=\frac{9!}{4!}$
$=15120$
Discrete Mathematics and Its Applications, Seventh Edition
by Rosen, Kenneth
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
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