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[" The sum "sum(k=1)^(20)k(1)/(2^(k))" i...

[" The sum "sum_(k=1)^(20)k(1)/(2^(k))" is equal to: "],[[" (1) "2-(3)/(2^(17))," (2) "1-(11)/(2^(20))],[" (3) "2-(11)/(2^(19))," (4) "2-(21)/(2^(20))]]

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