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The sum to n terms of the series 1/2 + 3/4 + 7/8 + 15/16 + ....... is

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The sum to n terms of the series 1/2 + 3/4 + 7/8 + 15/16 + ....... is

(a) n – 1 – 2– n  

(b) 1

(c) n – 1 + 2– n

(d) 1 + 2– n

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Correct option (c)

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