If the coefficients of $ x^{3} $ and $ x^{4} $ in the expansion of $ \left(1+a x+b x^{2}\right)(1-2 x)^{18} $ in powers of $ x $ are both zero, then $ (a, b) $ is equal to

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If the coefficients of \( x^{3} \) and \( x^{4} \) in the expansion of \( \left(1+a x+b x^{2}\right)(1-2 x)^{18} \) in p…

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