45
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There are 135751 combinations of 4 numbers (NOT DIGITS) that can be made from the numbers 1 to 44.
3 x 3 x 3 x 3 = 81 combinations
10,000.
5040, assuming none of the digits are the same. (Assuming they're not, there's 5040 unique combinations you can make out of 7 digits).
9999
Assuming no duplication or repetition, 720