A physical system is modeled by the function f(x)=∑n=0∞xn3nf(x) = \sum_{n=0}^{\infty} \frac{x^n}{3^n}f(x)=∑n=0∞3nxn. What is the value of f(1)f(1)f(1)?
12\frac{1}{2}21
32\frac{3}{2}23
111
333