two balls are drawn from a bag containing 3 red, 3 green and 4 black balls. find the probability that: (a) both are red, (b) one is green, and one is black, (c) both are of the same color. (a) (b) (c) 2. an urn contains 4 red balls and 6 white balls. a ball is drawn from the urn and a ball of the other color is then put into the urn. a second ball is then drawn from the urn. (a) find the probability that the second ball is red. (b) if both balls were of the same color, what is the probability that they were both red.