A bag contains 4 white balls, 5 red balls, 2 black balls and 4 green balls. A ball is drawn at random from the bag. Find the probability that it is not green.
Total number of balls = 15
Number of balls which are not green = 4 + 5 + 2 = 11
∴ P(getting a ball which is not green) =`"Number of favourable outcomes "/"Number of all possible outcome"= 11/15`
Thus, the probability of getting a ball which is not green is`11/150.`