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$\large \lim_{n\to \infty} 3 \left( \dfrac{2^3-1}{2^3+1} \times \dfrac{3^3-1}{3^3+1} \times \dfrac{4^3 - 1}{4^3 + 1} \times \cdots \times \dfrac{n^3-1}{n^3+1} \right) = \, ?$

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