College Algebra (6th Edition)

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 768: 22

Answer

$\frac{20_{{P}{_{2}}}}{2!}$ -$20_{{C}{_{2}}}$ = 0

Work Step by Step

$\frac{20_{{P}{_{2}}}}{2!}$ -$20_{{C}{_{2}}}$ = $\frac{(\frac{20!}{(20 - 2)!})}{2!}$ - $\frac{20!}{(20 - 2)!.2!}$ = $\frac{20!}{(20 - 2)!.2!}$ - $\frac{20!}{(20 - 2)!.2!}$ = 0
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