one man is on the ground floor there are 3switches of 3bulbs which are on the 1st floor which can't be seen from the ground floor and the can go only once to the first floor so how will he find which bulb is related to which switch

• switch1, switch2 and switch 3
  Switch 1 -> he didn't touch that
  switch 2 -> he switch it on and wait for 5 min and switch off it
  switch 3 -> he switch on it.
  Now he goes to the first floor and check which bulb light is turned on it indicates that it related to switch 3. Now he goes and touch the remining two bulbs, switch 2 is on for 5 min so the bulb gets heat, so when he touched the bulb which has some heat he related that bulb with switch 2 then switch 1 related to the bulb which remins cool.
• 7 years agoHelpfull: Yes(0) No(0)