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[" 66.Find the sum to "n" terms of the s...

[" 66.Find the sum to "n" terms of the series whose "n^(" in ")" term is "n(n-1)(n+1)],[" 67.Find the sum of first "n" terms of the series "n^(" th ")" term is given by "n(n^(2)" ."],[" 68.Find the sum of the series "13^(2)+2,52" ,"2^(3)+5^(3)+...]

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