21stCenturion wrote:

Ways of selecting first team:

8C2 = 28

2nd team: 6C2 = 15

3rd team: 4C2 = 6

4th team: 2C2 = 1

Therefore, using the multiplication principle, the total number of ways =

28 X 15 X6 X 1 = 2520

However, order of selection does not matter, hence we must divide

this number by the factorial of the number of teams...

Answer = 2520/4! = 105

had this problem always when do i add n when do i multiple.. pls someone explain!

_________________

vazlkaiye porkalam vazltuthan parkanum.... porkalam maralam porkalthan maruma