Solution of problem N4889 probability theory

Solution of problem N4889 probability theory

4889. The box contains 25 parts, including 19 standard ones. The assembler randomly takes out two parts. Find the probability that: both extracted parts will be standard; at least one of the two parts will be standard.

Additional information:

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

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