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SCALCET$811\mathrm{.}8\mathrm{.}024.$

Find the radius of convergence, $R,$ of the series.

${\displaystyle \underset{n=1}{\overset{}{}}}\frac{n^2{x}^n}{6*12*18*cdots*(6n)}$

$R=$

Find the interval, I, of convergence of the series. $($Enter your answer using interval notation.$)$

$1=$

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