If ""^(n)P(r)=30240and ""^(n)C(r)=252 ...

If `""^(n)P_(r)=30240`and `""^(n)C_(r)=252` then the ordered pair (n,r)=

A

(12,6)

B

(10,5)

C

(9,4)

D

(16,7)

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The correct Answer is:

B

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