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[" The co-efficient of "x^(n)" in "(1+x+2x^(2)+3x^(3)+....+nx^(n))^(2)" is "],[[" (A) "(n(n^(2)+11))/(6)," (B) "(n(n^(2)+10))/(6)],[" (C) "(n(n^(2)+11))/(4)," (D) "(n(n^(2)+10))/(4)]]

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