Shot selection

A can hit a target 4 times in 5 shots , B can hit a target 3 times in 4 shots , C can hit a target 2 times in 3 shots, All the three fire a shot each. What is the probability that two shots are at least hit ?

Atul can hit a target 3 times in 6 shots, Bhola can hit the target 2 times in 6 shots and Chandra can hit the 4 times in 4 shots. What is the probability that at least 2 shots (out of 1 shot taken by each one of them) hit the target ?