If r and n are positive integers, r gt 1...

If r and n are positive integers, `r gt 1, n gt 2` and the coefficient of
`(r+2)^(th)` term and `3r^(th)` term in the expansion of `(1+x)^(2n)` are
equal, then n equals

A

3r

B

`3r+1`

C

2r

D

`2r+1`

Verified by Experts

The correct Answer is:

C

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