there are 3 lamps in room, and there are 3 switches in other room, i want you to know with switch for the first lamp , how you can know the right switch fort the lamp?, but you can only leave the room one time to check
Top answer
1. Turn on switch A. Wait for several minutes then turn it off.
— Zhao_the_Passerby
1.
Turn on switch A.
Wait for several minutes then turn it off.
2.
Turn on switch B.
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1. Turn on switch A. Wait for several minutes then turn it off. 2. Turn on switch B. 3. Enter the next room, and touch the two dark lamps with your hand. ( Be careful! ) 4. Then you know the answer.