Ononot — Evaluate \sum{n=1}^{\infty} \frac{(-1)^{n+1}}{n \cdot 2^n} b

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Power Seriesmedium

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Evaluate $\sum_{n=1}^{\infty} \frac{(-1)^{n+1}}{n \cdot 2^n}$ by recognizing it as a power series evaluated at a specific point.