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CBSE XI
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Math
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Binomial Theorem
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If the second ,third and fourth term in the expansion of $(x+a)^n$ and $240,720$ and $1080$ respectively,then the value of $n$ is
$\begin{array}{1 1}(A)\;15\\(B)\;20\\(C)\;10\\(D)\;5\end{array} $
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