Question 304104
How many different positive three-digit integers can be formed if the three digits 4,5, and 6 must be used in each of the integers 
a 3 b 4 c 6 d 8 e none 

4 5 6
4 6 5
5 4 6
5 6 4
6 4 5
6 5 4
3! or 6
so c 6