Answer
$20$
Work Step by Step
$\dfrac {6!}{3!\times 3!}=\dfrac {3!\times 4\times 5\times 6}{3!\times 3!}=\dfrac {4\times 5\times 6}{3!}=\dfrac {4\times 5\times 6}{1\times 2\times 3}=20$
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: 11
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