Q #1 - A math teacher wants to give each student a 3 digit number using only the numbers 2, 3 and 6. Numbers can be repeated. How many possible combinations are there?
Q #2 - (simplified) How many possible four digit combinations are there for the numbers 1, 2, 3 and 4 only using each number once in each combination.
The Attempt at a Solution
A #1 - I come up with 27, but I know there is a formula that will help me reach that number without writing each possibility out.
A #2 - I remember from years ago in my HS days a formula that was something like: 4 x 3 x 2 x 1 to figure out this type of questions, but maybe I am way off. Any ideas?