If the coefficients of x^3 and x^4 in the expansion of (1 + ax + bx^2)(1 - 2x)^ 18 in powers of x are both zero, then (a, b) is equal to:

JEE Main 2014 Mathematics question

If the coefficients of and in the expansion of in powers of x are both zero, then is equal to:

Answer: (A)

Coefficient of : . Coefficient of :

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Question ID VK-008709