Geometry
posted by
Jacob
.
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