A bad contains 4 black balls, 6 blue balls, 3 white balls and 5 red balls :

A bad contains 4 black balls, 6 blue balls, 3 white balls and 5 red balls. One ball is drawn from the bag. probability that the ball drawn is black or white
(a) 5/18
(b) 7/18
(c) 4/15
(d) 4/5