[" 26.The sum of "1+(2)/(5)+(3)/(5^(2))+...

[" 26.The sum of "1+(2)/(5)+(3)/(5^(2))+(4)/(5^(3))+..." up to "n" terms is "],[[" (1) "(25)/(18)-(4n+5)/(16times5^(n-1))," (2) "(3)/(4)-(2n+5)/(16times5^(n+1))]]

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