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[" 4.The sum of the first "n" ' terms of...

[" 4.The sum of the first "n" ' terms of the series "],[(1)/(2)+(3)/(4)+(7)/(8)+(15)/(16)+cdots" is "],[[" (2) "2^(n)-n-1," (b) "1-2^(-n)],[" (c) "n+2^(-n)-1," (d) "2^(n)-1]]

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