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Question Number 140798 by Dwaipayan Shikari last updated on 12/May/21

$$\underset{n=1}{\sum ^{\mathrm{\infty }}}\frac{1}{n^3\left(\begin{array}{c}4n\\ n\end{array}\right)}$$

Commented by john_santu last updated on 14/May/21

$$\frac{\pi }{3\sqrt{3}}$$

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