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Evalaute: lim(n→∞) ( (1 x n + 2 x (n – 1) + 3 x (n – 2) + ... + n x 1)/n^3)

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Evalaute: lim(n→∞) ( (1 x n + 2 x (n – 1) + 3 x (n – 2) + ... + n x 1)/n3)

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Let tr = (n - r + 1) x r

= 1/6

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