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The contents of urns I, II and III are a...

The contents of urns I, II and III are as follows
Urn I: I white, 2 black and 3 red balls
Urn II: 2 white, 1 black and 1 red balls
Urn III: 4 white, 5 black and 3 red balls. One urn is chosen at random and two balls are drawn. They happen to be white and red. What is the probability that they come from urn I, II or III?

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