The correct option is A n! ^nP_r = n! (n r)! So, ^nP_n = n! (n n)! = n! 0! #160; = n ! (Since 0 ! = 1 ) ...

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Properties of Measures of Central Tendency

nPn=.

Question

$^{n} P_{n} =$ ____.

n!

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(n - 1)! (3)

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1

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(n + 1) 6

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Solution

The correct option is A $n!$
$^{n} P_{r} = \frac{n!}{(n - r)!}$
So, $^{n} P_{n} = \frac{n!}{(n - n)!} = \frac{n!}{0!} = n!$ (Since $0! = 1)$

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