Answer
$P(8,4) = 1680$
Work Step by Step
Use the formula $P(n, r)=\dfrac{n!}{(n-r)!}$:
$P(8,4)
\\ = \dfrac{8!}{(8-4)!}
\\= \dfrac{8!}{4!}
\\= \dfrac{8\times7\times6\times5\times4!}{4!}
\\= 8\times7\times6\times5
\\ = 1680$
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: 13
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