An urn contains 9 red, 7 white and 4 black balls. A ball is drawn at random. What is the probability that the ball drawn is not red?

Question

Accepted Answer

P (red) = 9 / (9 + 7 + 4) = 9/20 ∴ P(not-red) = (1 - 9/20) = 11/20

Discussion & Comments