There are 15180 combinations.
Only one: 2468. The order of the digits in a combination does not make a difference.
Just one. In a combination, the order of the digits does not matter.
There are 210 4 digit combinations and 5040 different 4 digit codes.
There are 126 different 5 digit combinations. Note that the combination 12345 is the same as the combination 45312.
With 123 digits you can make 123 one-digit numbers.
There are infinite combinations that can make 3879
6,720 combinations.
10x9x9x9
Using the eight digits, 1 - 8 ,-- There are 40,320 eight-digit permutations.-- There is 1 eight-digit combination.
There is only one combination. There are many permutations, though.
The question is incorrect since there are 210 - 1 possible combinations. The digit 0 can be in the combination or out. That gives 2 ways. With each, the digit 1 can be in the combination or out - 2*2 = 22 ways. With each, the digit 2 can be in the combination or out = 23 ways. With each, the digit 3 can be in the combination or out = 24 ways. etc. So 210 ways in all except that one of them is the null combination. Now 210 = 1024 so there are only 1023 combinations. If, instead, you allow the digits to be used many times, there is no limit to the number of combinations.