1000
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It depends. If you can only use each number once, there are 720 combinations. If you can use numbers multiple times, then there are 1000 combinations, by using all numbers from 000 to 999.
1000: from 000 to 9991000: from 000 to 9991000: from 000 to 9991000: from 000 to 999
200 000 000
It is -9 999 999 999. If limited to positive whole numbers, it is 1 000 000 000.
The short answer is 1000. This is very easy to visualise: Simply consider each number in the combination to be a digit in a decimal number. We then end up with a three-digit number. Such a three-digit number ranges in value from 000 to 999, or 1000 unique combinations.