If in the expansion of (x^3- 1 x^2 )^n, n N, sum of the coefficients of x^5 and x^ 10 is zero, then n=

JEE Main Mathematics question

If in the expansion of , , sum of the coefficients of and is zero, then

Answer: (C)

The general term is ; needs and needs , so . The two coefficients and 1)^{r_2}$

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Question ID VK-021197