A bag contains 3 red balls, 5 black balls and 4 white balls. A balls is drawn at random from the bag. What is the probability that the ball drawn is:
(i) white?
(ii) red?
(iii) black?
(iv) not red?
Total number of possible outcomes, n(S) = 12 {3 red balls, 5 black balls and 4 white balls)
(i) n(E) = 4
(ii) n(E) = 3
(iii) n(E) = 5
(iv) n(E) = 9