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[tex] \sum _{n=1} ^{\infty} \frac{x^n}{3^n} = \sum _{n=1} ^{\infty} \frac{x}{3} \left( \frac{x}{3} \right)^{n-1} = \frac{\frac{x}{3}}{1-\frac{x}{3}} = \frac{x}{3-x} [/tex]
[tex] \textrm{How can I obtain the interval of convergence of the given series? Thanks.} [/tex]
[tex] \textrm{How can I obtain the interval of convergence of the given series? Thanks.} [/tex]