# What is the interval of convergence of #sum_1^oo ((3x-2)^2)/(n*x*3^n) #?

Is convergent for all

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The interval of convergence for the series ( \sum_{n=1}^{\infty} \frac{(3x-2)^2}{nx \cdot 3^n} ) is ( -\frac{1}{3} < x < \frac{1}{3} ).

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