Given positive integers r >1,n >2 and th...

Given positive integers `r >1,n >2` and that the coefficient of `(3r d)t ha n d(r+2)t h` terms in the binomial expansion of `(1+x)^(2n)` are equal. Then `n=2r` b. `n=2r+1` c. `n=3r` d. none of these

A

`n=2r`

B

`n=2r+1`

C

`n=3r`

D

None of these

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The correct Answer is:

A

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