# Math Help - Find the interval of convergence of the power series

1. ## Find the interval of convergence of the power series

Problem 1:

Find the interval of convergence of the power series

Σ ( 2^(n+1)(x 3)/(n + 3)3^(n1) )
n=1

2. hey just use the standard test that is $\frac{1}{\rho}=\biggl|\frac{a_{n+1}}{a_n}\biggr|$