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0.9808
52
50
There are 2 ways to get blackjack...You can be dealt an ace first:4/52 are Aces, then 16 out of the remaining 51 cards are 10, J, Q or K4/52 X 16/51 = .0241Or you can be dealt a face card first:16/52 are face cards, then 4 out of the remaining 51 cards are Aces16/52 X 4/51 = .0241So your answer is .0241 + .0241 = .0482 or 4.82%
If it matters in what order you draw them, then the number of permutations of 52 things taken three at a time is 52! - (52-3)! = 52 * 51 * 50 = 132,600.If it does not matter in what order you draw them, the usual case, then the number of combinations of 52 things taken 3 at a time is (52! - (52-3)!) / 3! = 52 * 51 * 50 / 3 / 2 / 1 = 22,100.