9 x 9 x 8 x 7 = 4,536
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There are 5! = 120 such numbers.
There are 4 possible numbers if the digits are not repeated; 18 if they are. Those are 3-digit numbers, assuming that zero would not be a leading digit. If zero is allowed for a leading digit, then you can have 6 for the non repeated, and 27 if repetition.
738 numbers
There are 5760 such numbers.
1 set