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OpenStudy (pulsified333):
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 Then a ball is withdrawn from the chosen urn.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 1 white and 2 red balls, and urn 2 has 4 white and 4 red balls. If a white ball is drawn, what is the probability that it came from urn 1?
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