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You have a total of 16 balls, 3 blue, 4 green, and 9 red. You also...

You have a total of 16 balls, 3 blue, 4 green, and 9 red. You also have 3 urns. You put each of the 16 balls in an urn selected at random. (a) What is the probability that no urn is empty? (b) What is the probability that each urn contains 3 red balls?

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