Answer
See below.
Work Step by Step
${n\choose r}=\frac{n!}{r!(n-r)!}$ by definition, thus ${8\choose2}=\frac{8!}{2!(8-2)!}$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 11 - Section 11.4 - The Binomial Theorem - Concept and Vocabulary Check - Page 864: 2
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