WENNIELENCAMPOSANO20IN WENNIELENCAMPOSANO20IN Math Answered Example 3. A box contains marbles 5 are red, 6 are blue and 9 are yellow. What is probability that red marble will be pick?. S = (5 red, 6 blue ,9 yellow) total of 20 marblesP(red) = 5/20 or P (red) = ¼​