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

3r

B

`3r-1`

C

`3r+1`

D

2r

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The correct Answer is:

d

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