Question 399035
The answer is basically nPr, we use P as order is important here.

1) n= 10 ways (0-9)
2) r= 3,you pick 3 numbers out of the 10 
you put, 9P3 in your calculator, which should get: 

720 different ways. 

OR: 10x9x8 (the number of ways, i am assuming you cant repeat).

Hope this helps.