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

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

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