Answer
120
Work Step by Step
Five runners can finish a race in P(5, 5) ways
=$\frac{5!}{(5-5)!}$ [P(n, r) = $\frac{n!}{(n-r)!}$ ]
=$\frac{5!}{(0)!}$
==$120$
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: 8
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