Answer
$_{20}C_{20}=1$
Work Step by Step
$_nC_r=\frac{n!}{(n-r)!\times r!}$
$_{20}C_{20}=\frac{20!}{(20-20)!\times(20!)}=\frac{1}{0!}=\frac{1}{1}=1$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.5 - The Binomial Theorem - 11.5 Exercises - Page 813: 8
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