Prove that the sum of first …

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Prove that the sum of first n terms of the series (1×1)+2(2×2)+(3×3)+2 (4×4)+..............is, (1) n(n+1)(n×1)/2 ,where n is even (2) n×n (n+1)/2 ,where n is odd

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CBSE > Class 11 > Mathematics

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