1.

Sum of the series S = 1 + 12(1 + 2) + 13(1 + 2 + 3) + 14 (1 + 2 + 3 + 4) + .........upto 20 terms is

Answer»

Sum of the series S = 1 + 12(1 + 2) + 13(1 + 2 + 3) + 14 (1 + 2 + 3 + 4) + .........upto 20 terms is




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