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

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

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