Got my exam today and I still can't grasp permutations properly. Can anyone help me with these questions?
A team consisting of 7 players is to line up for a photograph in a single line. The photographer insists that the two tallest players cannot stand together. How many possible line-ups are there?
Also, I tried to work this one out.. But because it says "At least" it's kind of thrown me, as the teams could have 4, 5 or 6 female members.
A class consists of 12 female and 8 male students. 6 students are to be selected to take part in a quiz. How many different teams would be possible if the team had to have at least 4 female members?
12C4 * 8C2 would be the way to go if it was 4 females, but the at least bit confuses me. Help?