It depends on how many numbers make one combination.
Here are the possibilities for combinations of several different sizes:
Numbers in the combination
Possible combinations
1 . . . . . 32
2 . . . . . 496
3 . . . . . 4,960
4 . . . . . 35,960
5 . . . . . 194,432
6 . . . . . 906,192
7 . . . . . 3,365,856
8 . . . . . 10,518,300
If order doesn't matter, 15 combinations and if order does matter, 360 combinations are possible.
24
There are infinitely many numbers and so infinitely many possible combinations.
There are 39 possible combinations to obtain $0.49. See the image below with the complete list of possible combinations.
10x9x9x9
There are millions of possible combinations.
10,000
2^n possible combinations
There are 2^5 = 32 different combinations of the five traits possible.
There are 167960 combinations.
Since a number can have infinitely many digits, there are infinitely many possible combinations.
Four outcomes, three combinations.
If repeats are allowed than an infinite number of combinations is possible.
There are 5,040 combinations.
3,124,550 possible combinations
35
56 combinations. :)