Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 11 - Further Topics in Algebra - 11.4 The Binomial Theorem - 11.4 Exercises - Page 1045: 26



Work Step by Step

$20$C$5$ is equivalent with the following expression: $\binom{20}{5} =\frac{20!}{5!\times (20-15)!}=\frac{15!\times16\times17\times18\times19\times20}{15!\times5!}=\frac{16\times17\times18\times19\times20}{5\times4\times3\times2\times1}=\frac{1.860.480}{120}=15.504$
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