C In Problems 31-34, one of two urns is chosen at random, with one as likely to be chosen as the other. Then a ball is withdrawn from the chosen urn. Urn 1 contains 1 white and 4 red balls, and urn 2 has 3 white and 2 red balls. 31. If a white ball is drawn, what is the probability that it came from urn 1? 32. If a white ball is drawn, what is the probability that it came from urn 2? 33. If a red ball is drawn, what is the probability that it came from urn 2? 34. If a red ball is drawn, what is the probability that it came from urn 1?

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