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[" Sum of the first "n" terms of the series "(1)/(2)+(3)/(4)+(7)/(8)+(15)/(16)+cdots],[" is equal to "],[" a."2^(x)-n-1" b."1-2^(-n)quad " c."n+2^(-n)-1" d."2^(n)+1],[" (MT-JEE,"1988)]

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