Solution of problem N3464 probability theory

Solution of problem N3464 probability theory

3464. At the exam, the student is offered 20 tickets, each with three questions. Of the 60 questions included in the tickets, the student knows 50. What is the probability that a ticket taken by a student will consist of two known and one unknown question?

Additional information:

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

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