9+8+2=19 9+7+3=19 9+6+4=19 There are a limited number of possibilities but there are absolutely loads
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
There are 15180 combinations.
There are 38760 combinations.
There are 1140 five digit combinations between numbers 1 and 20.
There are 1,120,529,256 combinations.
There are 5,461,512 such combinations.
There are 840 4-digit combinations without repeating any digit in the combinations.
There are 210 4 digit combinations and 5040 different 4 digit codes.
There are 9C3 = 84 combinations.
There are 1140 5 digit combinations from 1 to 20. 20 combination 3 computes that.
64
14