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If .^(n)P(r)=x.^(n-1)P(r-1), then which...

If `.^(n)P_(r)=x.^(n-1)P_(r-1)`, then which of the following is the value of x?

A

n

B

`n(n-1)`

C

`(n-r)/(n)`

D

`(n)/(n-r)`

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