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10,000
If the numbers and letters can be repeated then there are 45,697,600 possible outcomes. If the letters and numbers can not be repeated there are 32,292,000 possible outcomes.
As with decimal numbers, there are infinitely many of them and so it is not possible to list them.
There are infinitely many possible pairs of numbers. One possible pair is -1 and 24.
Considering there are 10 possible numbers, and you want 9 numbers to be chosen, then you multiply 10x10 to the 9th power and get 10,000,000,000 (10 billion) possible numbers.