The contents of urns A,B,C are as follows
UrnA: 1 white 2 black 3 red balls
UrnB:2 white 1balck 1red balls
UrnC: 4 white,5 black 3 red balls .One urn is chosen at random and 2 balls drawn from it they happen to be white and red .What is the probability that they come from urn A,B,C?
