The coefficient of xn in the expansion of 1-x-1-x2 is

The correct option is D 4n ( 1+x 1 x #160;) #160;^ 2 =( 1+x ) #160;^ 2 ( 1 x ) #160;^ 2 =( 1+2x+ x ^ 2 ) ( 1+2x+3 x ^ 2 +..... ) ...

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Combination

The coefficie...

Question

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

2 n

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4 n

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8 n

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16 n

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x^{p}

{(x^{2} + \frac{1}{x})}^{2 n}

\frac{(2 n)!}{(\frac{4 n - p}{3})! (\frac{2 n + p}{3})!}

x^{p}

{(x^{2} + \frac{1}{x})}^{2 n}

⎡ ⎢ ⎢ ⎢ ⎢ ⎣ \frac{(2 n)!}{(\frac{4 n - p}{3})! (\frac{2 n + p}{3})!} ⎤ ⎥ ⎥ ⎥ ⎥ ⎦

In the expansion of $(\frac{1 + x}{1 - x})^{2}$ , the coefficient of $x^{n}$

x^{n}, n ϵ N

\frac{1 + x}{1 + x^{2}}

\frac{1}{x}

(1 + x)^{n} {(1 + \frac{1}{x})}^{n}

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