Answer
Please see below.
Work Step by Step
$_nP_r$ represents the number of permutations of $n$ things taken $r$ at a time, which equals$$\frac{n! }{(n-r)! }.$$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 10 - Section 10.6 - Counting Principles, Permutations, and Combinations - Exercise Set - Page 1105: 76
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