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Q)

Sum of $\;\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\frac{1}{3.4.5.6}+\;.....\;upto\;\infty\;is$

$(a)\;\frac{1}{24}\qquad(b)\;\frac{1}{18}\qquad(c)\;\frac{1}{27}\qquad(d)\;\frac{1}{6}$

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