an isolated room has a bulb with three switches on the outside. identify which switch will make the bulb work
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turn a switch on and wait for 10 mins
then switch it off and turn on another switch
get in the room
the bulb which is off but hot is the first switch
the bulb which is on is the second switch
the bulb which is off and cold is the third switch
then switch it off and turn on another switch
get in the room
the bulb which is off but hot is the first switch
the bulb which is on is the second switch
the bulb which is off and cold is the third switch
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