10 balls are randomly withdrawn from an urn that contains 12 black, 15 white, 10 red and 10 blue balls (without replacement). Find the probability for each of the following events. (Correct the answers to 5 decimal places. For example, if the answer is sin(/7)= 0.4338837393..., then any number between 0.43388 and 0.43389 is acceptable.) Black and white balls are withdrawn (at least 1 black and at least 1 white, 0 red and 0 blue). Answer: 1 At least 1 black ball and at least 1 white ball are withdrawn. Answer: 2