Решение задачи N4694 теория вероятностей полиномиальный

4694. For each lottery ticket with a probability of 0.2 there may be a big win, with a probability of 0.15 a small win, and with a probability of 0.65 the ticket may be without a win. Bought 15 tickets. Determine the probability of getting 3 big wins and 1 small win.

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