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Posted 27 January 2008 - 04:56 PM
Posted 28 January 2008 - 07:58 AM
turn switch one off and turn switch two on.
walk in the room.
the warm bulb belongs to switch one, the lit bulb belongs to switch two and the cold bulb belongs to switch three.
Posted 30 January 2008 - 01:56 AM
Posted 01 February 2008 - 07:33 PM
leave one switch off = light bulb off
turn one switch on then off just before you enter the room = bulb that is warm to the touch
Posted 01 February 2008 - 08:33 PM
Posted 02 February 2008 - 05:54 AM
2nd- Turn and keep switch 1 on, Turn switch 2 on for about a minute, Keep switch 3 off.
3rd - Go next door light 1 will be on, Light 2 will be warm but off, Light 3 will be off and cold.
Thus only going into room once and you will have correctly identified the 3 switches to the 3 lights.
Posted 06 February 2008 - 12:33 AM
Bulbs - Back to the Logic Puzzles
This is one of my favorite logic puzzles (Edit: it is more a practical than a logic puzzle).
Imagine you are in a room with 3 switches. In an adjacent room there are 3 bulbs (Edit: let's say in lamps which are on a regular table) - all are off at the moment, each switch belongs to one bulb. It is impossible to see from one room to another. How can you find out which switch belongs to which bulb, if you may enter the room with the bulbs only once?
Edit: No help from anybody else is allowed.
Edit: Find out which switch belongs to which bulb - identify all 3 switches (so find out what bulbs are switches 1, 2 and 3 connected to)Spoiler for Solution
Posted 06 February 2008 - 05:01 PM
Posted 08 February 2008 - 04:07 AM
that would be so much easier than touching hot bulbs
-1 switch off = bulb off
-1 switch on = bulb on
-1 switch halfway (yes you can do this) = bulb dim & flickering
Posted 08 February 2008 - 01:15 PM
Turn on Switch A for 5 minutes. Turn of A. Turn on B. Go to the room. If X is on then X belongs to B. Feel Y and Z. If Y is warm then Y belongs to A. Then Z must be belong to C.
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