The coefficient of x^{2012} in the expansion | vedclass

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Question

$ (1-x)(1-x)^{2007}\left(1+x+x^2\right)^{2007} $

$ (1-x)\left(1-x^3\right)^{2007} $

$ (1-x)\left({ }^{2007} C_0-{ }^{2007} C_1\left(x^3\right)+\

Vedclass · Accepted Answer

$0$

Vedclass · Answer

$ (1-x)(1-x)^{2007}\left(1+x+x^2ight)^{2007} $

$ (1-x)\left(1-x^3ight)^{2007} $

$ (1-x)\left({ }^{2007} C_0-{ }^{2007} C_1\left(x^3ight)+\ldots \ldots .ight)$

General term

$ (1-x)\left((-1)^r{ }^{2007} C_r x^{3 r}ight) $

$ (-1)^{r 2007} C_r x^{3 r}-(-1)^{r 2007} C_r x^{3 r+1} $

$ 3 r=2012 $

$ r 
eq \frac{2012}{3} $

$ 3 r+1=2012 $

$ 3 r=2011 $

$ r 
eq \frac{2011}{3}$

Hence there is no term containing $\mathrm{x}^{2012}$.

So coefficient of $x^{2012}=0$

The coefficient of $x^{2012}$ in the expansion of $(1-x)^{2008}\left(1+x+x^2\right)^{2007}$ is equal to

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