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If ""^(n)P(r)=k xx ""^(n-1)P(r-1) what i...

If `""^(n)P_(r)=k xx ""^(n-1)P_(r-1)` what is k:

A

r

B

n

C

n+1

D

r+1

Text Solution

Verified by Experts

The correct Answer is:
B
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