A bag contains 5 white balls, 7 red balls, 4 black balls and 2 blue balls. One ball is drawn at random from the bag. What is the probability that the ball drawn is

(i) white or blue?

(ii) red or black?

(iii) not white?

(iv) neither white nor black?

(i) white or blue?

(ii) red or black?

(iii) not white?

(iv) neither white nor black?