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If("^(n+2)C8):("^(n-2)P4) = frac{57}{16}...

If`("^(n+2)C_8)`:`("^(n-2)P_4)` = `frac{57}{16}` , then `n` is equal to

A

A.5

B

B.20

C

C.21

D

D.19

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