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Suppose a room is filled with 2 types of urns, which are equally common. The 2 types are as follows: Type A urns have 1 black marbles, 4 white Type B urns have 3 black marbles, 2 white Suppose we select an urn at random and draw two marbles with replacement. What is the probability it's a Type A urn if the first draw is black and the second is white?