If ∑n=0∞anxn\sum_{n=0}^{\infty} a_n x^n∑n=0∞anxn has radius of convergence R=3R = 3R=3, what is the radius of convergence for ∑n=0∞anx2n\sum_{n=0}^{\infty} a_n x^{2n}∑n=0∞anx2n?
R=1R = 1R=1
R=3R = 3R=3
R=3R = \sqrt{3}R=3
R=9R = 9R=9