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One of two urns is chosen at random with one just as likely to be chosen...

One of two urns is chosen at random with one just as likely to be chosen as the other. Then a ball is withdrawn from the chosen urn. Urn 1 contains 3 white and 2 red balls, and urn 2 has 1 white and 5 red balls. If a white ball is drawn, what is the probability that it came from urn 1?

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