Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

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: 20


$C(18,1) = 18$

Work Step by Step

Use the formula $C(n, r)=\dfrac{n!}{(n-r)!r!}$: $C(18,1) \\= \dfrac{18!}{(18-1)!\times1!} \\= \dfrac{18!}{17!} \\=\dfrac{18\times17!}{17!} \\= 18$.
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