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$The coefficient of x^{2} in \frac{1 + x^{2}}{(1 - x)^{3}} is$

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Correct option is C

1+x2(1−x)3=1+x2(1−x)−3=1+x21+3C1x+4C2x2+5C3x3+…=1+x21+3x+6x2+… Coefficient of x2=1+6=7 .

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The coefficient of x2 in 1+x2(1−x)3 is

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$The coefficient of x^{2} in \frac{1 + x^{2}}{(1 - x)^{3}} is$