A bag contains 13 white and 7 black balls. Two balls are drawn at random. What is the probability that they are of the same colour? 

A

$$\frac{41}{190}$$

B

$$\frac{21}{190}$$

C

$$\frac{59}{290}$$

D

$$\frac{99}{190}$$

E

$$\frac{77}{190}$$