There are 1,120,529,256 combinations.
There are 9C3 = 84 combinations.
6 of them.
Only one.
How many four digit combinations can be made from the number nine? Example, 1+1+2+5=9.
120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.
There are 15180 combinations.
If the 6 digits can be repeated, there are 1296 different combinations. If you cannot repeat digits in the combination there are 360 different combinations. * * * * * No. That is the number of PERMUTATIONS, not COMBINATIONS. If you have 6 different digits, you can make only 15 4-digit combinations from them.
10 Combinations (if order doesn't matter). 3,628,800 Possiblilities (if order matters).
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
It is: 9C7 = 36
66