Answer
$36$
Work Step by Step
${n \choose k}=\frac{n!}{k!(n-k)!}$
Hence here: ${9 \choose 2}=\frac{9!}{2!(9-2)!}=\frac{9\cdot8}{2}=36$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 8 - Summary, Review, and Test - Test - Page 791: 5
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