E
Editor
Sep 18, 2022
$^{n}P_{r}$=
Difficulty: Easy
A:
$\frac{(n-1)!}{r!}$
B:
$\frac{n!}{(n-r)!}$
C:
$\frac{n!}{r!}$
D:
$\frac{(n-r)!}{r!}$
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ID: 63273dbaca83163ac3a12383