3 Three urns contain, respectively, 1 white and 2 black balls, 2 white and 1 black balls, 2 white and 2 black balls. A blindfold man transfers one ball from the first urn into the second, then one ball from the second urn into the third. A ball is drawn from the third urn. What is the probability of its being white?

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Chapter1: Combinatorial Analysis
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3 Three urns contain, respectively, 1 white and 2 black balls, 2 white and 1
black balls, 2 white and 2 black balls. A blindfold man transfers one ball from
the first urn into the second, then one ball from the second urn into the third.
A ball is drawn from the third urn. What is the probability of its being white?
Transcribed Image Text:3 Three urns contain, respectively, 1 white and 2 black balls, 2 white and 1 black balls, 2 white and 2 black balls. A blindfold man transfers one ball from the first urn into the second, then one ball from the second urn into the third. A ball is drawn from the third urn. What is the probability of its being white?
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