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[" The sum of the first n terms of the s...

[" The sum of the first n terms of the series "],[(1)/(2)+(3)/(4)+(7)/(8)+(15)/(16)+..." is "],[[" (A) "2^(n)-n-1," (B) "1-2^(-n)],[" (C) "n+2^(-n)-1," (D) "2^(n)-1]]

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