4690. For each lottery ticket, with a probability of 0.15, a big win can fall, with a probability of 0.15, a small win, and with a probability of 0.7, the ticket can turn out to be without a win. Bought 15 tickets. Determine the probability of getting 2 big wins and 2 small ones.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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