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If the coefficient of $r$th and $(r+1)$th terms in the expansion of $(3+7x)^{29}$ are equal , then $r=$

\[\begin {array} {1 1} (a)\;14 & \quad (b)\;15 \\ (c)\;18 & \quad (d)\;21 \end {array}\]
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(d) 21
answered Nov 7, 2013 by pady_1

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