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Let "Delta"r=|r x(n(n+1))/2 2r-1y n^2 3r...

Let `"Delta"_r=|r x(n(n+1))/2 2r-1y n^2 3r-2z(n(3n-1))/2|` . Show that `sum_(r=1)^n"Delta"_r=0` .

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