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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 Then a ball is withdrawn from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 6 red​ balls, and urn 2 has 5 white and 2 red balls. If a red ball is​ drawn, what is the probability that it came from urn 2​?

The probability is__?

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