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An urn contains 2 white and 2 black ball...

An urn contains `2` white and `2` black balls. A ball is drawn at random, If it is white, it is not replaced into the urn. Otherwise, it is replaced with another ball of the same colour. The process is repeated. Find the probability that the third ball drawn is black.

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The correct Answer is:
`(23)/(30)`
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