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The number of permutations of n differen...

The number of permutations of n different things taken r at a time in which 4 particular things never occur is -

A

`.^(n)P_(r-4)`

B

`.^(n-4)P_(r-4)`

C

`.^(n-4)P_(r)`

D

`.^(n)P_(r)-4`

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