1. 15
2. 60 outfits
3. 16 outcomes
4. 720 different ways
5. 17 576 000 number plates
6. 4 536 pin numbers
7. 120 different ways of sitting around the table.
8. 720 arrangements
9. 7! x 3! = 30 240 arrangements
10. 9! / (2!.2!.2!.2!) = 22 680 different ways
