Решение задачи N4128 теория вероятностей Лапласа

4128. The computer system contains 45 identical microelements. The probability that any microelement will work at a given time is 0.80. To perform a certain operation, it is required that at least 30 trace elements be in working condition. What is the probability that the operation will be completed successfully?

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