You have a set of 3 light switches outside a closed door. One of them controls the light inside the room. With the door closed from outside the room, you can turn the light switches on or off as many times as you would like.You can go into the room - one time only - to see the light. You cannot see the whether the lig.....

• On the 1 st switch wait some time and put off.
  On the 2 nd switch too.
  Now go to the room,
  if
  Bulb is hot = correct one is 1 st
  Bulb glows = 2 and
  Bulb is neither hot nor glow = 3 rd switch is correct one
• 9 years agoHelpfull: Yes(1) No(1)