Решение задачи N1930 теория вероятностей

1930. Four lots of materials must be supplied from different suppliers for construction. The probability that the parties will be delivered on time is 0.9, respectively; 0.8; 0.7 and 0.95. Find the probability that at least one party will not be delivered on time.

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