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Find the sum to 'n' terms of 1.2.3 +2.3....

Find the sum to 'n' terms of 1.2.3 +2.3.4+3.4.5+……

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Find the sum of 'n' terms of 1.2 +2.3+3.4+4.5+……

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Find the sum to n terms series 1^(2) + (1^(2) + 2^(2)) (1^(2) + 2^(2) + 3^(2)) + . . . . .

Find the sum to n terms of the series , (1)/(1.2)+(1)/(2.3)+(1)/(3.4)+.... ?