Решение задачи N4653 теория вероятностей Байеса

4653. Parts are processed on two machines, of which the first produces 3 times more parts than the second. In this case, the probability of marriage for the first machine is 0.1, for the second - 0.15. One randomly taken part turned out to be standard. Find the probability that it was processed on the first machine.

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