An urn contains 12 white, 5 yellow and 13 black marbles. A marble is chosen at random from the urn, and it is noted that is not one of the black marbles. What is the sample space in view of this knowledge? What it the probability that it is yellow? Solution probability of the ball being yellow = 5/12+5 =5/17 hope my answer is correct and please appreciate my help by awarding me karma points..