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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 replace into urn, otherwise it is replaced along with another ball of the same colour. The proccess is repeated, find the probability that the third ball drawn is black.

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The correct Answer is:
`(11)/(16)`
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