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Sum of the first n terms of the series 1...

Sum of the first `n` terms of the series `1/2+3/4+7/8+(15)/(16)+.........` is equals to (a).`2^n-n-1` (b). `1-2^(-n)` (c). `n+2^(-n)-1` (d).None of these

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CENGAGE PUBLICATION-SEQUENCES AND SERIES-All Questions
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