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


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: $

  1. $2 r+1$

  2. $2 r-1$

  3. $3 r$

  4. $r+1$

Correct Option: 1

JEE Main Previous Year 1 Question of JEE Main from Mathematics Binomial Theorem and its Simple Applications chapter.
JEE Main Previous Year Online April 25, 2013


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