Решение задачи N4623 теория вероятностей Пуассона

4623. The electronic system consists of 2000 elements. The probability of failure of any of them during the year is 0.001 and does not depend on the state of other elements. Find the probability of failure for a year of work: a) two elements; b) at least two elements.

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