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[" 8.If the coefficients of "r^(" th ")"...

[" 8.If the coefficients of "r^(" th ")" and "(r+1)^(" th ")" terms in "],[" the expansion of "(3+7x)^(29)" are equal,then "r],[" equals "-],[[" (A) "15," (B) "21],[" (C) "14," (D) None of these "]]

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