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An urn contains 60 marbles, of which 20 are green, 15 are purple, 15 are red, and 10 are yellow. Six marbles are selected at

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An urn contains 60 marbles, of which 20 are green, 15 are purple, 15 are red, and 10 are yellow. Six marbles are selected at random and without replacement. Find the probability that (a) the selected marbles appear in the sequence: green, purple, green, red, red, and yellow; (b) \"three green\" or \"two purple\" marbles are obtained; (0) the 4th marble selected is a green marble

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