Решение задачи N4710 теория вероятностей полиномиальный

4710. For each lottery ticket with probability p1=0.2 there can be a big win, with probability p2=0.25 a small win, and with probability p3=0.55 the ticket can be without a win. Bought n=14 tickets. Determine the probability of getting n1=3 big wins and n2=4 small ones.

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