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[" The sum of "n" terms of the series "1+(1+x)+(1+x+x^(2))+(1+x+x^(2)+x^(3))+..." where "x!=1" is "],[[" (1) "(1)/(1-x)," (2) "(n)/(1-x)," (3) "(n)/(1-x)-(x(1-x^(n)))/((1-x)^(2))," (4) "n]]

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