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Let Deltar=|[r-1,n,6],[(r-1)^2,2n^2,4n-2...

Let `Delta_r=|[r-1,n,6],[(r-1)^2,2n^2,4n-2],[(r-1)^3,3n^3,3n^2-3n]|`. Show that `sum_(r=1)^n Delta_r` is contant.

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