Answer
The identity is verified.
$_nC_r=\frac{_nP_r}{r!}$
Work Step by Step
$_nC_r=\frac{n!}{(n-r)!~r!}=\frac{\frac{n!}{(n-r)!}}{r!}=\frac{_nP_r}{r!}$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.6 - Counting Principles - 11.6 Exercises - Page 825: 90
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