JEE Main & Advanced
Sample Paper
JEE Main Sample Paper-28
question_answer
If for positive integers \[r>1,\,\,n>2\], the coefficients of the \[{{(3r)}^{th}}\] and \[{{(r+2)}^{th}}\] power of \[x\] in the expansion of \[{{(1+x)}^{2n}}\] are equal, then n is equal to