We´ve got 3 archers. Every archer shoots only once. The Probability that the first archer will hit the target is 0.7, second 0.8 and third 0.9.
What is the probability that at least two of them will hit the target?
I've tried to complete it, I've calculated the Probability that at least one of them will hit the target and tried to delete from it options when one of them will hit the target.