A bag contains 3 white, 5 black and 2 red balls, all of the same shape and size. A ball is drawn from the bag without looking into it, find the probability that the ball drawn is: (iii) a white ball. (iv) not a red ball.
A bag contains 3 white, 5 black and 2 red balls, all of the same shape and size. A ball is drawn from the bag without looking into it, find the probability that the ball drawn is: (iii) a white ball. (iv) not a red ball.

(iii) There are 3 white balls

So, the number of favourable outcomes = 3

Thus, P(getting a white ball) = 3/10 = 3/10

(iv) There are 3 + 5 = 8 balls which are not red

So, the number of favourable outcomes = 8

Thus, P(getting a white ball) = 8/10 = 4/5