evaluate sum upto n terms 6+9+16+27
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https://www.meritnation.com/ask-answer/question/evaluate-13-33-53-73-upto-n-terms/mathematical-induction-and-binomial-theorem/9801733
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https://www.meritnation.com/ask-answer/question/evaluate-13-33-53-73-upto-n-terms/mathematical-induction-and-binomial-theorem/9801733
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