1. The problem statement, all variables and given/known data Two archers A and B take turns to shoot, with archer A taking the first shot. The probabilities of archers A and B hitting the bull's eye is 1/6 and 1/5 respectively. Show that the probability of archer A hitting the bull's eye first is 1/2. 2. Relevant equations 3. The attempt at a solution Well, i thought about drawing tree diagram but the problem is I have no idea when to stop because I don't know when he will hit.