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Sum the series (1)/(3.6) +(1.3)/(3.6.9) ...

Sum the series `(1)/(3.6) +(1.3)/(3.6.9) +(1.3.5)/(3.6.9.12)+… `

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The correct Answer is:
`S=(2)/(3) -(1)/(sqrt(3))`
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