A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is:
(i) red?
(ii) not red?
(i) 3/8
(ii) \(\dfrac{5}{8}\)
Total number of balls = 3 + 5 = 8. Probability of drawing a red ball = 3/8. The event “not red” means drawing a black ball, so its probability is \(\dfrac{5}{8}\), or equivalently 1 − 3/8.