Solution of problem N3123 probability theory

Solution of problem N3123 probability theory

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.

Additional information:

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

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