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21 September, 02:34

Urn A has balls numbered 1 through 6. Urn B has balls numbered 1 through 4. What is the probability that a 4 is drawn from A followed by a 2 from B?

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  1. 21 September, 02:51
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    Drawing the tree diagram of the problem, we see that there are 6 branches for drawing from Urn A, and then 4 branches for each of the 6 branches, for drawing from Urn B.

    This means that there are 6*4=24 possible outcomes, which could be listed as

    { (1, 1), (1, 2), (1, 3), (1, 4), (2, 1) ... (6, 3), (6, 4) },

    where the first coordinates represent drawing from urn A, and the second coordinates, drawing from urn B.

    (4, 2) is one of these 24, so the probability is 1/24

    remark, this problem could also have been solved by the multiplication principle of the probabilities of separate events, that is 1/6 (probability of drawing 4 from Urn A) times 1/4 (probability of drawing 2 from B) = 1/24

    Answer: 1/24
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Home » Mathematics » Urn A has balls numbered 1 through 6. Urn B has balls numbered 1 through 4. What is the probability that a 4 is drawn from A followed by a 2 from B?
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