An urn contains 5 red balls and 6 blue balls. A ball is drawn. If the ball is red, it is kept out of the urn and an additional blue ball is added to the urn. Then, a second ball is drawn from the urn. If the ball is blue, then it is put back in the urn and an additional blue ball is added to the urn. Then a second ball is drawn from the urn.
If the second drawn ball is blue, what is the probability that the first drawn ball was blue?
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answere: 5 red 6 blue balls
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