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Urn 1 | Urn 2 | Urn 3 B R R -> 3/7 * 5/9 * 4/8 = (3*4*5) / (7*8*9) = 5 / (7 * 2 * 3) R B R -> 4/7 * 4/9 * 4/8 = (4*4*4) / (7*8*9) = 8 / (7 * 9) R R B -> 4/7 * 5/9 * 4/8 = (4*5*4) / (7*8*9) = 10 / (7 * 9) Sum: 5 / (7 * 2 * 3) + 18 / (7 * 3 * 3) = (15 + 36)/(7*2*3*3) = 51/126 = 17 / 42
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Day 2: Compound Event Probability
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