## Algebra and Trigonometry 10th Edition

Published by Cengage Learning

# Chapter 11 - 11.5 - The Binomial Theorem - 11.5 Exercises - Page 813: 8

#### Answer

$_{20}C_{20}=1$

#### Work Step by Step

$_nC_r=\frac{n!}{(n-r)!\times r!}$ $_{20}C_{20}=\frac{20!}{(20-20)!\times(20!)}=\frac{1}{0!}=\frac{1}{1}=1$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.