You can make:
4379, 4397, 4973, 4937, 4793, 4739
3794, 3749, 3974, 3947, 3479, 3497
7934, 7943, 7439, 7493, 7394, 7349
9743, 9734, 9473, 9437, 9374, 9347
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3 digit numbers are lessthan 4 digit numbers
24 = 4*3*2*1
5040
106------------------------------------------------------------------------------------------------From Rafaelrz.You can make, 4P3 = 4!/(4-3)! = 24, different 3 digit numbers using 1, 2, 3 and 4.
9999