Thursday, April 15, 2010
Three Switches
You are standing outside a room next to three switches, all of which are off. Each switch operates a different light bulb in the room. The room door is closed, so you cannot see which switch operates which bulb. You are only allowed to go into the room once. Determine which switch operates which bulb.
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for this .....first we have to swicth any one bulb...and stay outside the room for few minute..and nw switch off that switch..and again swith on some other bulb switch ...and now go to the room........there u will get one bulb which operate that switch u recently switch on...and get one more bulb which r hot ..dat was switched before.obviously u get last one.which is not used.for switch.:).
ReplyDeleteits simple..........1st switch any bulb switch...wait there for 5 min.and then switch off dat switch..and again u switch some other bulb switch ..and go to room ..there u will get one hot bulb. one unused bulb,and one bulb which is used currently.by that u can easily get that solution....1.hot bulb
ReplyDelete2.used bulb (currently switch on one)
3.unused one....