SOLUTION: How many combinations of players can a coach have if he needs to pick 2 out of a total of 4?

If the 4 players are A,B,C,D, here are all 6 ways to pick 2
from the 4:

1.  Pick A & B
2.  Pick A & C
3.  Pick A & D
4.  Pick B & C
5.  Pick B & D
6.  Pick C & D 

Edwin