Mathematics · Probability
U1, U2, U3 are three urns. U1 contains 5 red, 3 white, 2 black balls; U2 contains 4 red, 4 white, 2 black balls and U3 contains 3 red, 4 white, 3 black balls. If an urn is chosen at random and a ball is drawn from it at random, then the probability of not getting a black ball is:
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