I've been going over some review for some placement test I have to take, I've never done anything with Matrices (I think that's the plural for Matrix, haha) and I'm ruuuuusty on solving permutations:
I don't think these are particularly difficult, I'm just slow in the subjects..Thanks for anyone who can clarify
We are NOT taking the total amount/number of people here. The exclamation mark ! that you see after the numbers is called factorial.
7!= 1*2*3....*7
3!= 1*2*3
4!= 1*2*3*4
To know how this formula comes, you need to study permutations and combinations..Google it.
This link might be useful