Solution of problem N4659 probability theory

Solution of problem N4659 probability theory

4659. There are products of four grades, and the number of products of each grade is, respectively, 1, 2, 3, 4. For control, 7 products are taken at random. Determine the probability that among them 1 is a first-class item, 1 is a second-grade item, 2 is a third-grade item, and 3 is a fourth-grade item.

Additional information:

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

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