Question
The probability of A hitting a target is 
and that of B hitting it is 
They both fire at the target. Find the probability that
(i) at least one of them will hit the target.
(ii) only one of them will hit the target.
Solution
Let E denote the event ‘A hits the target’ and F denote the event ‘B hits the target’.
(i) P(none of them hits the target) =
(ii) P(only one of them hits the target) =
(i) P(none of them hits the target) =
(ii) P(only one of them hits the target) =
