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The sum Sigma(n=1)^(7) (n(n+1)(2n+1))/(4...

The sum `Sigma_(n=1)^(7) (n(n+1)(2n+1))/(4)` is equal to __________.

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  20. The sum Sigma(n=1)^(7) (n(n+1)(2n+1))/(4) is equal to .

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