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In: Math

find the radius of convergence and interval of convergence of the series ∑ n=1 ~ ∞...

find the radius of convergence and interval of convergence of the series ∑ n=1 ~ ∞ (3^n)((x+4)^n) / √n

Please solve this problem with detailed process of solving.

I can't understand why the answer is [-13/3, -11/3)

I thought that the answer was (-13/3, -11/3].

Can you explain why that is the answer?

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