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[" Duntrus is "sum(r=1)^(n)r^(2)-sum(m=1...

[" Duntrus is "sum_(r=1)^(n)r^(2)-sum_(m=1)^(n)sum_(r=1)^(n)r" is aqual "10],[[" (a) "0," (b) "(1)/(2)(sum_(r=1)^(n)r^(2)+sum_(r=1)^(n)r)]]

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