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Find the coefficient of x in the expansion of
Answers (1)
(1-3x+7x2) (1-x)16 ….. (given)
= (1-3x+7x2) (106C0 - 16C1x1 + 16C2x2 + …… + 16C16x16)
= (1-3x +7x2) (1-16x+120x2+…..)
Thus, coefficient of x = -19
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