4714. Each lottery ticket with probability p1=0.25 may get a big win, with probability p2=0.35 a small win, and with probability p3=0.4 the ticket may end up without a win. Bought n=14 tickets. Determine the probability of getting n1=2 big wins and n2=2 small ones.

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