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Let S denote sum of the series 3/(2^3)+4...

Let `S` denote sum of the series `3/(2^3)+4/(2^4 .3)+5/(2^6 .3)+6/(2^7 .5)+oo` Then the value of `S^(-1)` is __________.

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CENGAGE ENGLISH-SEQUENCES AND SERIES-All Questions
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