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**Xeritas** My high school teacher gave us the following problem:

The coefficients of the power series (starting at n=0 and continuing for all real numbers) a_{n}(x-2)^{n} satisfy a_{0} = 5 and a_{n }= ((2n+1)/(3n+1))a_{n-1} for all n≥1. What is the radius of convergence of the series?

I've been taught to use the "ratio" test. Effectively placing the n+1 term over the nth term, simplifying, and then evaluating. Based on my work I believe that the answer should be 0, but am unsure whether it is correct due to that fact that I was absent when the material was taught.

P.S. Does anyone know how to write sigma notation in a word processor or in html?