rank that we have 4 of and then 12 ways to pick the rank we have one of, so
the answer is
13
·
12
4
4
4
1
52
5
.
An example. What is the probability that in a poker hand we get exactly
3 of a kind (and he other two cards are of different ranks)?
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 Spring '10
 ansan
 Probability, Prime number, Playing card, Card game, poker hand, different ranks

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