3464. At the exam, the student is offered 20 tickets, e

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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?

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

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