Question

When there is three tube light out of the room and we want to find that which button is of which tube light so how can we find that which button is of which light we can switch on the button many times but only one time go out to see that which is that one that switch we on.

Answer 1

we will put the first light on for long time then the second light on and go in if the tube light is hot it means the button if first one if the light is on then it is second one and it is not hot or the light is not on then it is third one