When two bulbs A and B are connected in series and a third bulb is added to the circuit, what will happen to the brightness of all bulbs if the third bulb is connected in series with bulbs A and B?

Increase

Decrease

Remain the same

Cannot be determined from the given information

Explanation

If the third bulb is connected in series with bulbs A and B, the total resistance in the circuit will increase. As a result, the current flowing through the circuit will decrease, leading to a decrease in the brightness of all bulbs.