Consider the series ∑n=0∞anxn\sum_{n=0}^{\infty} a_n x^n∑n=0∞anxn where an=2na_n = 2^nan=2n. What is the radius of convergence?
R=1R=1R=1
R=12R=\frac{1}{2}R=21
R=2R=2R=2
R=∞R=\inftyR=∞