Solution of problem N4684 probability theory

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4684. There are products of four grades, and the number of products of each grade is, respectively, 2, 3, 1, 3. For control, 4 products are taken at random. Determine the probability that among them 1 is a first-class item, 2 is a second-grade item, 0 is a third-grade item, and 1 is a fourth-grade item.

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

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