If ""^(n)C(r-1)=36, ""^(n)C(r )=84 and "...

If `""^(n)C_(r-1)=36, ""^(n)C_(r )=84` and `""^(n)C_(r+1)=126` then the value of `""^(n)C_(8)` is

A

10

B

7

C

9

D

8

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