We can write it as:
$a_n = \frac{(2n)!}{(2n-1)!}$
Now, we will use the Ratio Test to find the radius of convergence. The Ratio Test states that if $\lim_{n\to\infty} \left|\frac{a_{n+1}}{a_n}\right| = L$, then the series converges if $L < 1$, diverges if $L >
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