If the coefficient of x3 and x4 in the expansion of (1+ax+bx2)(1−2x) – InterviewSolution

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1.	If the coefficient of x3 and x4 in the expansion of (1+ax+bx2)(1−2x)18 in the powers of x are both zero, then (a,b) is equal to:
Answer» If the coefficient of $x^{3}$ and $x^{4}$ in the expansion of $(1 + a x + b x^{2}) (1 - 2 x)^{18}$ in the powers of $x$ are both zero, then $(a, b)$ is equal to:

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