Which of the following series is a convergent geometric series?
∑n=1∞(32)n\sum_{n=1}^{\infty} (\frac{3}{2})^n∑n=1∞(23)n
∑n=0∞(12)n\sum_{n=0}^{\infty} (\frac{1}{2})^n∑n=0∞(21)n
∑n=1∞2n\sum_{n=1}^{\infty} 2^n∑n=1∞2n
∑n=0∞(54)n\sum_{n=0}^{\infty} (\frac{5}{4})^n∑n=0∞(45)n