Solution of problem N4897 probability theory

Solution of problem N4897 probability theory

4897. There are n=23 parts in a box, among which m=18 are standard. 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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