Answer
$P(8,4)=1680$
Work Step by Step
Using the permutation formula, we obtain:
$P(8,4)=\frac{8!}{(8-4)!}=\frac{8!}{4!}=\frac{8\cdot7\cdot6\cdot5\cdot4!}{4!}=1680$
or
$P(8,4)=8\cdot7\cdot6\cdot5=1680$
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