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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)22, when n is even. When n is 11, the sum is |
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Answer» The sum of the first n terms of the series 12+2×22+32+2×42+52+2×62+… is n(n+1)22, when n is even. When n is 11, the sum is |
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