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[" If in the expansion of "(1+x)^(15)" ,...

[" If in the expansion of "(1+x)^(15)" ,the coefficients of "(2r+3)^(" th ")" and "(r-1)^(" th ")],[" then the value of "r" is "],[[" (a) "5," (b) "6," (c) "4," (d) "3]]

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