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[" ze sum of "n" terms of the series "1^...

[" ze sum of "n" terms of the series "1^(2)+2.2^(2)+3^(2)+2.4^(2)+5^(2)+2.6^(2)+..." is "(n(n+1)^(2))/(2)" when "n" i "],[" en.The sum of the series when "a" is odd is "]

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