Brad is right for the chance of say ..... seeing 1 head out of 2 coins, however there is the possibility of seeing 2 heads. You have two independent coins, so the "odds" of coin flips work like this.

Lets say you are intersested in the "odds" of seeing heads while flipping 2 coins. The possibilities and odds of different combinations are:

2 Heads 25% (1:3)
1 Head 1 Tail 50% (1:1)
2 Tails 25% (1:3)

If you are interested in the "odds" of seeing AT LEAST 1 Head, they are 75% or 3:1 (50% of seeing 1 plus 25% of seeing 2).

This is a pure statistical look at it .... remember you are dealing with nature .

Neil