3123. In a group, 5 people study perfectly well, 7 good

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Uploaded: 04.11.2018
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3123. In a group, 5 people study perfectly well, 7 good and excellent, 15 have triples and 3 people have twos. Find the probability that the called student does not have twos or threes.

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

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