$r$ and $n$ are positive integers $r1, n2$ and coefficient of $(r+2)^{ ext {th }}$ term and $3 r^{ ext {th }}$ term in the expansion of $(1+x)^{2 n}$ are equal, then $n$ equals

Question

$r$ and $n$ are positive integers $r>1, n>2$ and coefficient of $(r+2)^{	ext {th }}$ term and $3 r^{	ext {th }}$ term in the expansion of $(1+x)^{2 n}$ are equal, then $n$ equals

$r$ and $n$ are positive integers $r>1, n>2$ and coefficient of $(r+2)^{\text {th }}$ term and $3 r^{\text…