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     EduGorilla 
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    The sum of first n terms of the series 1/2 + 3/4 + 7/8 + 15/16 + …… is equal to

    Options :-

    1. 2n - n + 1
    2. 1 - 2-n
    3. n + 2-n - 1
    4. 2n - 1
    5. None of the above
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