Urn I contains 25 white and 20 black balls. Urn II
Chapter , Problem 14(choose chapter or problem)
Urn I contains 25 white and 20 black balls. Urn II contains 15 white and 10 black balls. An urn is selected at random and one of its balls is drawn randomly and observed to be black and then returned to the same urn. If a second ball is drawn at random from this urn, what is the probability that it is black?
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