• JEE Main & Advanced
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• 11th
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• Mathematics
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Q.

The sum of the first \(n\) terms of the series

\(1^2 + 2 . 2^2 + 3^2 + 2 . 4^2 + 5^2 + 2.6^2 + ... is\)

\(n(n+1)^2 \over 2\), when \(n\) is even. When \(n\) is odd, the sum is