Answer
$C(8,2) = 28$
Work Step by Step
Use the formula $C(n, r)=\dfrac{n!}{(n-r)!r!}$:
$C(8,2)
\\= \dfrac{8!}{(8-2)!2!}
\\= \dfrac{8\times7\times6!}{6!\times2!}
\\= \dfrac{8\times7}{2!}
\\= \dfrac{8\times7}{2}
\\=\dfrac{56}{2}
\\=28$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 12 - Counting and Probability - Section 12.2 Permutations and Combinations - 12.2 Assess Your Understanding - Page 875: 15
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