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There are 1140 five digit combinations between numbers 1 and 20.
There are 1140 5 digit combinations from 1 to 20. 20 combination 3 computes that.
There are 38760 combinations.
There are 167960 9 digits combinations between numbers 1 and 20.
4+4+4+4+4= 20
There are 45 combinations.
I am assuming you mean 3-number combinations rather than 3 digit combinations. Otherwise you have to treat 21 as a 2-digit number and equate it to 1-and-2. There are 21C3 combinations = 21*20*19/(3*2*1) = 7980 combinations.
There are 4845 combinations.
Assuming no repeated digits, lowest first, 20; in any order 120; Allowing repeated digits: 216
There are 6C3 = 20 such combinations.
There are 167960 combinations.
There are 125970 combinations and I am not stupid enough to try and list them!