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Professor Paula Hammond (one of the greatest chemical engineers in the world} has two urns. One of two urns has a: red and 3; black

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Professor Paula Hammond (one of the greatest chemical engineers in the world} has two urns. One of two urns has a: red and 3; black balls, and the other has 2 red and to black balls. One ball is chosen at random from each urn, and then one of these two balls is chosen at random. What is the probability that this ball is red? (Hint: Draw a. picture)

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