Ononot — Let f(x) = \sum{n=0}^{\infty} an x^n be a power series with

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Power Serieshard

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Let $f(x) = \sum_{n=0}^{\infty} a_n x^n$ be a power series with a finite radius of convergence $R$ . If $a_n$ satisfies the relation $a_{n} = a_{n-1} \cdot \frac{n^2 + 1}{n^2 + n}$ , which of the following is the correct radius of convergence $R$ for this series?