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Let "Delta"r=|r-1n6(r-1)^2 2n^2 4n-2(r-1...

Let `"Delta"_r=|r-1n6(r-1)^2 2n^2 4n-2(r-1)^2 3n^3 3n^2-3n|dot` Show that `sum_(r=1)^n"Delta"_r` is contant.

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