4700. Each lottery ticket with probability p1=0.19 can get a big win, with probability p2=0.11 a small win, and with probability p3=0.7 the ticket can end up without a win. Bought n=15 tickets. Determine the probability of getting n1=3 big wins and n2=1 small ones.

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