Urn 1 contains 4 red and 6 white balls. Urn 2 contains 3 red and 6 white balls. A ball is drawn from urn 1 and placed in urn 2. Then a ball is drawn from urn 2.     If the ball drawn from urn 2 is​ red, what is the probability that the ball drawn from urn 1 was​ red?

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