Answer
$_5P_0 = 1$
Work Step by Step
RECALL:
$_nP_r = \dfrac{n!}{(n-r)!}$
Use this definition to have:
$\require{cancel}
_5P_0=\dfrac{5!}{(5-0)!}
\\_5P_0=\dfrac{5!}{5!}
\\_5P_0 = 1$
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