3 switch puzzle
There are three switches outside the room .
Two Of which are useless , while one is connected to a lightbulb inside the room.
You can on or off any switch any number of time (it also cover you can on or off any number of switch together) .
You have one, and only one, opportunity to go inside the room and look .
Question is : How can you tell which switch goes to light?
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switch on the second switch for five minute and then switch it off and then immediately switch on 3rd one and enter the room. Touch the bulb:
ReplyDelete1> if buld is on then 3rd switch.
2> if the buld is off but is hot then second switch.
3> if the bulb is off and is cold first switch
I go out side 1switch on on 5 min and off the switch
ReplyDeleteAnd on 2nd switch
And gi in room
When bulb is shine
So 2 switch is connected to bulb
When bulb is not shine but hot
So 1 switch is connected to bulb
When bulb not shine and not hot
So 3 switch is connected to bulb