If in the expansion of (1+x)^m (1-x)^n, the coefficients of x and x^2 are 3 and -6 respectively then

JEE Advanced Mathematics question

If in the expansion of , the coefficients of and are 3 and respectively then

Answer: (C)

Coefficient of : . …(1)

Coefficient of : C_{2}$ - mn +

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Question ID VK-109987