When a switch is closed current flows in a circuit [through the switch); when a switch is open, current does not flow. Switches operate independently. Under prescribed conditions the probability that a switch is closed is denoted by c. For each of the following arrangements, find the probability that current ows from A to B. Show all working. la) 0 5w1 . (d) Sw1 Sw2 O O A Sw3 B(e) Sw2 O Sw1 O A Sw4 B