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Two urns contain respectively 2 red, 3 w...

Two urns contain respectively 2 red, 3 white and 3 red, 5 white balls. One ball is drawn at random from the first urn and transferred into the second. A ball is now drawn from the second urn and it turns out to be red. What is the probability that the transferred ball from first urn was white ?

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The correct Answer is:
`(9)/(17)`
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