Answer
$45$
Work Step by Step
$\binom {10} 2 =\dfrac {10!}{2!\left( 10-2\right) !}=\dfrac {8!\times 9\times 10}{2!\times 8!}=\dfrac {9\times 10}{1\times 2}=45$
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: 17
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