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

If `""^(n) C_(r-1) = 36 and ""^(n) C_(r ) = 84`, then a)`13r-3n-3=0` b)`10r-3n-3=0` c)`10r+ 3n-3=0` d)`10r-3n+ 3=0`

A

`13r-3n-3=0`

B

`10r-3n-30=0`

C

`10r+ 3n-3=0`

D

`10r-3n+ 3=0`

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The correct Answer is:
A
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