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The coefficient of x in the expansion of $(1 - 3 x + 7 x^{2}) (1 - x)^{16}$ is

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Correct option is B

1−3x+7x2(1−x)16 =1−3x+7x2 16C0−16C1x+16C2x2+…After multiplying, the term containing x is 16C1x−3x16C0x ∴ Coefficient of x=−16−3=−19

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The coefficient of x in the expansion of 1−3x+7x2(1−x)16 is

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The coefficient of x in the expansion of $(1 - 3 x + 7 x^{2}) (1 - x)^{16}$ is