Solution of problem N3399 probability theory

Solution of problem N3399 probability theory

3399. A student came to the test knowing only 25 questions out of 40, what is the probability of a test, if there are 2 questions in the ticket and you need to know at least one question for the test?

Additional information:

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

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