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Power Serieshard
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Let f(x)=∑n=0∞anxnf(x) = \sum_{n=0}^{\infty} a_n x^nf(x)=∑n=0∞​an​xn be a power series with radius of convergence RRR. If the sequence of coefficients {an}\{a_n\}{an​} is defined by the recurrence relation an+1=n+2n+1ana_{n+1} = \frac{n+2}{n+1} a_nan+1​=n+1n+2​an​ with a0=1a_0 = 1a0​=1, what is the radius of convergence RRR?