There are 504 such numbers.
123456789
-123456786
823543
81
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
There are 3024 of them.
There are 60480 numbers.
There are 504 such numbers.
123456789
-123456786
823543
81
There are 5! = 120 such numbers.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
3x3x3=27
24