In the expansion of (x^3- 1 x^2 )^n, n N , if the sum of the coefficients of x^5 and x^ 10 is 0 then n is

JEE Advanced Mathematics question

In the expansion of , , if the sum of the coefficients of and is 0 then is

Answer: (C)

. Let occur at : . Then occurs at (since ). Sum of coefficients:

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Question ID VK-108312