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: 18



Work Step by Step

$\binom 9 3 =\dfrac {9!}{3!\left( 9-3\right) !}=\dfrac {6!\times 7\times 8\times 9}{3!\times 6!}=\dfrac {7\times 8\times 9}{1\times 2\times 3}=84$
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