Answer
See below.
Work Step by Step
$_nP_r$ refers to the number of ways of selecting $r$ objects out of $n$ objects if the order matters. $_nP_r=\frac{n!}{(n-r)!}$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 8 - Sequences, Induction, and Probability - Exercise Set 8.6 - Page 770: 76
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