Answer
See below.
Work Step by Step
If we want to choose $r$ elements out of $n$ regarding the order, not allowing repetition, we can do this in $_{n}P_r=\frac{n!}{(n-r)!}$ ways.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 10 - Section 10.2 - Permutations and Combinations - 10.2 Assess Your Understanding - Page 694: 5
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