Introduction - If you have any usage issues, please Google them yourself
1, 2, 3, 4 numbers can be composed of a number of three-digit different from each other and no duplication of digital? Are how many?
A program analysis: can fill in one hundred and ten digit figures are 1, 2, 3, 4. Composed of all the permutations and then go
Out does not meet the conditions of the arrangement.