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[" The value of "sum_(r=1)^(n){(2r-1)a+(1)/(b^(r))}" is equal to "],[[" (a) "ln^(2)+(b^(n)-1)/(b^(n-1)(b-1))," (b) "an^(2)+(b^(n)-1)/(b^(n)(b-1))],[" (c) "an^(3)+(b^(n-1)-1)/(b^(n)(b-1))," (d) none of these "]]

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