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CBSE XI
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Math
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Binomial Theorem
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The coefficient of $r^{th}$ and $(r+1)^{th}$ terms in the expansion of $(1+x)^{20}$ are in the ratio 1 : 2 then $r=$
$\begin{array}{1 1}(A)\;6\\(B)\;7\\(C)\;8\\(D)\;9\end{array} $
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