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The difference between the sum of the first k terms of the series 13+23+33+……+n3 and the sum of the first k terms of 1+2+3+……n is 1980. The value of k is

Answer» The difference between the sum of the first k terms of the series 13+23+33++n3 and the sum of the first k terms of 1+2+3+n is 1980. The value of k is


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