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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.

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The sum of the first n terms of the series 12 + 2.22 + 32 + 2.42 + 52 + 2.62 + .... is n(n + 1)2/2, when n is even. When n is odd. the sum is ....

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12 + 2.22 + 32 + 2.42 + 52 + ... upto n terms

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