How many combinations are there with 5 numbers?

5*4*3*2*1 = 120 combinations.

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No. The previous answerer has confused permutations and combinations.

There are only 25 = 32 combinations including the null combinations.

There is 1 combination of all 5 numbers

There are 5 combinations of 4 numbers out of 5

There are 10 combinations of 3 numbers out of 5

There are 10 combinations of 2 numbers out of 5

There are 5 combinations of 1 numbers out of 5

There is 1 combination of no 5 numbers

32 in all, or 31 if you want to disallow the null combination.