$^{n}P_{r}+^{n}C_{r}$=

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$^{n}P_{r}+^{n}C_{r}$=

E

Editor

Sep 18, 2022

$^{n}P_{r}+^{n}C_{r}$=

Difficulty: Easy

A:

\frac{1}{r!}

B:

\frac{n!}{r!}

C:

n!r!

D:

\frac{1}{n!}

ID: 63273dbaca83163ac3a12473