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24
24
4!=4x3x2x1=24
4! = 4*3*2*1 = 24 of them.
If no digit can be repeated then there are 5 combinations, abcd, abce, abde, acde and bcde. If you regard abdc as different from abcd then each of the 5 basic sets could be arranged 24 ways and the total would be 120 combinations.