Turn on first, wait few minutes, turn off first, turn on second and hurry in other room — first hot, second lights, third cold.

Turn on first and second, wait few minutes, turn off first, turn on third and hurry in other room: the first is hot and does not light, second is hot and lights, the third lights, but hasn't heated yet, fourth — does not light and cold.

Two lamps are turned on: hot and warm; and three lamps are turned off: hot, warm and cold.

Conundrum

There are 3 switches near you, and 3 lamps behind an opaque wall. It is possible to turn it on and off any number of one times, and one time to pass for a wall to the lamps. How to define accordance of lamps to the switches?Answer.

And if the number of lamps is 4? Answer.

And if the number of lamps is 5? Answer.