If f(x)=∑n=0∞anxnf(x) = \sum_{n=0}^{\infty} a_n x^nf(x)=∑n=0∞anxn has a radius of convergence R=3R=3R=3, what is the radius of convergence of ∑n=0∞anx3n\sum_{n=0}^{\infty} a_n x^{3n}∑n=0∞anx3n?
R=3R=3R=3
R=9R=9R=9
R=3R=\sqrt{3}R=3
R=33R=\sqrt[3]{3}R=33