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Questions  >>  CBSE XI  >>  Math  >>  Binomial Theorem
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The coefficient if $x^n$ in the expansion of $(1+x+x^2+...)^{-n}$ is

$\begin{array}{1 1}(A)\;1\\(B)\;(-1)^n\\(C)\;n\\(D)\;n+1\end{array} $

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