Posted by
Jacob on
.
How many three digit numbers have three distinct digits?

Geometry 
Anonymous,
1st digit: 9 choices
2nd digit: 9 choices
3rd digit: 8 choices
so, 9*9*8

Geometry 
Jacob,
Actually not because the problem is asking for 3 digits such as 100

Geometry 
Jacob,
Sorry made a mistake you are right