4550. There are 3 white and 9 black balls in the urn. O

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Uploaded: 27.08.2020
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4550. There are 3 white and 9 black balls in the urn. One ball is taken out of the urn at random. What is the probability that the ball taken out turns out to be black?

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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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