The sum of the coefficients of x^ 2r , r=1,2,3, , in the expansion of (1+x)^ n is

JEE Advanced Mathematics question

The sum of the coefficients of , in the expansion of is

Answer: (B)

Putting and in and adding:

{}^{n}+{}^{n}+{}^{n}+==2^{n

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Question ID VK-108339