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[" The sum of the first "n" terms of the...

[" The sum of the first "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" is even.When "n" is odd,the sum is ".....]

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