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If P(n, n) denotes the number of permuta...

If P(n, n) denotes the number of permutations of n different things taken all at a time then P(n, n) is also identical to , where 0 `le` r `le` n

A

r! . P(n, n – r)

B

(n – r) . P(n, r)

C

n . P(n–1, n–1)

D

P(n, n–1)

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The correct Answer is:
A, C, D
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MOTION-THEORY AND EXERCISE BOOK-EXERCISE - 2 (LEVEL -II)
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