



 
David, I am going to assume that order matters, that is 2,3,5 is distinct from 2,5,3. Mathematicians call these permutations. How many permutations of one number can there be using 12 different numbers without using the same numbers more than once?
How many permutations of two numbers can there be using 12 different numbers without using the same numbers more than once?
How many permutations of three numbers can there be using 12 different numbers without using the same numbers more than once?
How many permutations of four numbers can there be using 12 different numbers without using the same numbers more than once?
If order is not important write back and I'll show you how to modify this technique,  


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