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

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

A

(12, 6)

B

(10, 5)

C

(9, 4)

D

(16, 7)

Text Solution

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The correct Answer is:
B
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