There are an infinite amount of numbers between any interval no matter how small.
e.g between 0.000000001 and 0.000000002 contain 0.0000000012..
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It is -9 999 999 999. If limited to positive whole numbers, it is 1 000 000 000.
200 000 000
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
1000