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प्रश्न
One urn contains two black balls (labelled B1 and B2) and one white ball. A second urn contains one black ball and two white balls (labelled W1 and W2). Suppose the following experiment is performed. One of the two urns is choosen at random. Next a ball is randomly chosen from the urn. Then a second ball is choosen at random from the same urn without replacing the first ball. What is the probability that two balls of opposite colour are choosen?
उत्तर
Given that one of the two urns is choosen
Then a ball is randomly choosen from the urn
Then a second ball is choosen at random from the same urn without replacing the first ball
If two balls of opposite colours are choosen then,
The required probability = `8/12 = 2/3`
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