**Question:**

If for positive integers $r>1, n>2$, the coefficients of the $(3 r)^{\text {th }}$ and $(r+2)^{\text {th }}$ powers of $x$ in the expansion of $(1+x)^{2 \mathrm{n}}$ are equal, then $n$ is equal to: $

Correct Option: 1

JEE Main Previous Year Online April 25, 2013

**Solution:**