Um A contains 2 red marbles and 1 blue marble. Um B contains 1 red marble and 2 blue marbles. Each um is equally likely to be selected. When an um is selected, each of the 3 marbles contained in the urm are equally likely to be drawn. Phoebe randomly selects one urm and randomly draws a marble from the selected urn. If the marble is blue, what is the probability that the selected urn is um B?

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