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Suppose that an, urn B(1) contains 2 wh...

Suppose that an, urn `B_(1)` contains 2 white and.3 black balls and another urn `B_(2)` contains 3 white and 4 black balls. One urn is selected at random and a ball is drawn from it: If the ball drawn is found black, find the probability that the urn chosen was `B_(1).`

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The correct Answer is:
`21/41`
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