Solution of problem N4646 probability theory

Solution of problem N4646 probability theory

4646. 20 textbooks are randomly placed on a shelf in the library, five of them are bound. The librarian takes three textbooks at random. Find the probability that at least one of the selected textbooks will be bound.

Additional information:

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

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