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The sum of the first 20 terms of the serie 3 7 15 31 1+- + .., is : 8 (JEE MAIN Online 20 (A) 39+2 (C) 38 +22 () 39+22 D 38+

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If 1+2+3+…n=55, then 1^3+2^3+3^3+…+n^3 is
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