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[" 1.The sum of the first "n" terms of t...

[" 1.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+z" "]]

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