Q .     The number of permutations of `n`
different things, taken `r` at a time, in
which `P (r ≤ n − p)` particular things will
never occure is :

BITSAT Mock
A

`P (n − p, r) × P (n, n − p)`

B

`P (n, r) × P (n, p)`

C

`P (n, r) − P (n, p)`

D

`P (n − p, r)`

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