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Questions  >>  CBSE XI  >>  Math  >>  Binomial Theorem
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Find the value of r if the coefficient of $(2r+4)^{th}$ and $(r-2)^{th}$ terms in the expansion of $(1+x)^{18}$ are equal.

$\begin{array}{1 1}(A)\;4\\(B)\;5\\(C)\;6\\(D)\;7\end{array} $

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