If the probability that each switch is closed is p, then find the probability of current flowing through AB

Consider an ideal juction diode. Find the value of current flowing through AB is

As the switch S is closed in the circuit shown in figure, current passing through it is

If the switch is closed then current will flow.

If the switch is closed then current will flow.

When the switch S is closed in the given circuit, the current passed through it is

Probability of switching on a bulb is a dark room is 0.35, then the probability of not switching the bulb is………….