Ononot — For the power series \sum{n=1}^{\infty} \frac{x^n}{n^2}, we

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Power Serieshard

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For the power series $\sum_{n=1}^{\infty} \frac{x^n}{n^2}$ , we know it converges for $|x| \leq 1$ . To prove uniform convergence on $[-r, r]$ for $0 < r < 1$ using the Weierstrass M-test, which bound $M_n$ can be used?