Solution of problem N3351 probability theory

Solution of problem N3351 probability theory

3351. In the ticket two questions from 60 questions of the program the student learned 40.
Find the probability of events:
1) The student knows both questions.
2) Knows one question
3) Knows at least one question

Additional information:

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

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