The probabilities are 0.4, 0.2, 0.3 and 0.1, respectively, that a delegate to a certain convention arrived by air, bus, automobile, or train.
Consider 12 randomly selected delegates at this convention. What is theprobability that from these 12 delegates, 3 arrived by air, 3 arrived by bus, 3arrived by automobile, and 3 arrived by train?