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2∑k=1∞k3⋅5⋅7⋅9⋯(2k+1)= ?\large 2 \sum_{k=1}^{\infty} \frac{k}{3 \cdot 5 \cdot 7 \cdot 9 \cdots (2k+1)} = \ ? 2k=1∑∞3⋅5⋅7⋅9⋯(2k+1)k= ?
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