A box contains 3 red, 3 white and 3 green balls, A ball is selected at random. Find the probability that ball picked up is a red ball.

Solution:

Sample Space = {}

n(S) = 9

Let A = Event of getting a red ball.

∴ A = {}

∴ n(A) = 3

P(A) = n(A) = 3 = 1 n(S) 9 3