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Two boxes are given. There are 15 white and 12 black balls in the first box, and 14 white and 18 black balls in the

Two boxes are given. There are 15 white and 12 black balls in the first box, and 14 white and 18 black balls in the second box. Anna provides the following experiment. Anna puts her hand in the first box, takes at once two balls and place them in the second box. Then, she takes one ball wihout looking from the second box.

What is the probability that she took a white ball from the second box?

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