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[" If the sum of "1+(1+2)/(2)+(1+2+3)/(3)+......" to "n" terms is "],[S," then "S" is equal to "quad " [Kerala (Engg.) "2002]],[[" (a) "(n(n+3))/(4)," (b) "(n(n+2))/(4)],[" (c) "(n(n+1)(n+2))/(6)," (d) "n^(2)]]

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