defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Mathematics Probability Probability of Random Experiments
Three persons \(P, Q\) and \(R\) independently try to hit a target. If the probabilities of their hitting the target are \(\dfrac{3}{4}, \dfrac{1}{2}\) and \(\dfrac{5}{8}\) respectively, then the probability that the target is hit by \(P\) or \(Q\) but not by \(R\) is.
1
\(\dfrac{39}{64}\)
2
\(\dfrac{21}{64}\)
3
\(\dfrac{9}{64}\)
4
\(\dfrac{15}{64}\)