Find the interval of convergence of 8 ∞0 n=0 9n (2n + 1)! Incorrect (Give your answer as an interval in the form (*.*). Use the symbol ∞o for infinity, U for combining intervals, and an appropriate type of parenthesis "(",")", "[","]" depending on whether the interval is open or closed. Enter Ø if the interval is empty. Express numbers in exact form. Use symbolic notation and fractions where needed.) x E DNE -x2n-1

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