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[" If "1+(1+2)/(2)+(1+2+3)/(3)+..." ton ...

[" If "1+(1+2)/(2)+(1+2+3)/(3)+..." ton terms is "S" .Then,"S" is equal to "],[[" (a) "(n(n+3))/(4)," (b) "(n(n+2))/(4)," (c) "(n(n+1)(n+2))/(6)," (d) "n^(2)]]

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