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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.
-123456785
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.
27 if the digits can be repeated. 6 if not.