$$a = \frac{1}{2}, b = \frac{1}{3}, x = \sum_{n = 0}^{\infty} a^{n}, y = \sum_{n = 0}^{\infty} b^{n}$$, then $$\frac{x+y}{x-y} = ?$$

A

$$\frac{14}{3}$$

B

7

C

$$7\frac{1}{2}$$

D

$$7\frac{1}{3}$$