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?
Solution:
Total number of balls = 3 red + 5 black = 8 balls.
(i) Probability of drawing a red ball:
The number of red balls = 3, and total balls = 8.
P(red) = 3/8
(ii) Probability of drawing a ball that is not red (i.e., black):
The number of black balls = 5, and total balls = 8.
P(not red) = 5/8