Find the interval of convergence for the power series $\sum_{n=1}^{\infty} \frac{(x-3)^n}{n!3^n}$.
If the interval is $(-\infty, \infty)$, type -inf in the first numerical blank and inf in the second numerical blank.
If the interval is of the form $\{c\}$, type c in the first numerical blank and type NA in the second.
If necessary, round decimals to one decimal place.
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