Решение задачи N1928 теория вероятностей

1928. Three sets of materials must be supplied from the construction of three different suppliers. It is known that the first supplier delivers materials on time in an average of 82% of all cases, the second - in 85%, the third - in 78%. Find the probability that at least one of the three parties will be delivered to the construction site in a timely manner.

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