Question

A bag contains 18 balls out of which x balls are red. If one ball is drawn at random from the bag, what is the probability that it is not red?

Answer 1

Total number of balls = 18.

Number of red balls = x.

Number of balls which are not red = 18 − x

∴ P(getting a ball which is not red) =`("Number of favourable outcome")/("Number of all possible outcomes")`

`=(18-x)/18`

Thus, the probability of drawing a ball which is not red is `(18-x)/18`.