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[" The sum of first "20" terms of the sequence "0.7,0.77,0.777,......," is : "],[[" (1) "(7)/(81)(179-10^(-20))," (2) "(7)/(9)(99-10^(-20))," (3) "(7)/(81)(179+10^(-20))," (4) "(7)/(9)(99-10^(-20))]]

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The sum of first 20 terms of the sequence 0.7, 0.77, 0.777, .. , is (1) 7/9(99-10^(-20)) (2) 7/(81)(179+10^(-20)) (3) 7/9(99+10^(-20)) (3) 7/(81)(179-10^(-20))

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