Answer
$84$
Work Step by Step
$\binom 9 3 =\dfrac {9!}{3!\left( 9-3\right) !}=\dfrac {6!\times 7\times 8\times 9}{3!\times 6!}=\dfrac {7\times 8\times 9}{1\times 2\times 3}=84$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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
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