If you use each number 1-9 only once to form a 5-number sequence:
For the first number in the sequence you will have 9 options, for the second you will have 8 (excluding the number used in position one), for the third you will have 7 (9 minus the 2 already used) and so on.
9 X 8 X 7 X 6 X 5 = 15,120 unique combinations.
1.) 12345
2.) 12346
3.) 12347
...
15,119.) 98764
15,120.) 98765
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6
There are 167960 combinations.
There are 10,737,573 combinations and you must think I am mad if you think I am going to list them!
You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.
It is: 9C7 = 36