Solution of problem N2796 probability theory

Solution of problem N2796 probability theory

2796. Of the 20 savings banks, 10 are located outside the city limits. For the survey randomly selected 5 savings banks. What is the probability that among those selected will be in the city: a) 3 savings banks; b) at least one?

Additional information:

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

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