Решение задачи N5188 теория вероятностей

5188. There are 32 parts in a box, 8 of them are defective. 7 parts were taken at random. Find the probability that among the extracted parts: a) there are no defective ones; b) no fit; c) exactly 2 good ones.

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