Решение задачи N2391 теория вероятностей Бернулли

2391. It is known that the final death of Count Dracula needs at least three silver bullets. Van Helsing has only 8 rounds in the clip, and the probability of hitting each shot is 5/7. Find the probability of the victory of good over evil.

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