Five cards are drawn from an ordinary deck of 52 playing cards. What is the probability of getting a full house? ( A full house consists of three of one kind and two of another kind.)
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choose 1 of 13 ranks for 3 of a kind, choose 3 from rank, .....
13c1*4c3 *12c1*4c2 /52c5 = 0.144%
13c1*4c3 *12c1*4c2 /52c5 = 0.144%