1 - P(he misses all four times) Probability of a hit in one shot =Probability of a miss in one shot = 1 - P(misses 1st time AND misses 2nd time AND misses 3rd time AND misses 4th time) "AND" means "MULTIPLY": 1 - P(misses 1st time)*P(misses 2nd time)*P(misses 3rd time)*P(misses 4th time) or about 68% of the time. Edwin