InterviewSolution
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You’re In A Room With Three Light Switches, Each Of Which Controls One Of The Three Light Bulbs In The Next Room. Find Out Which Switch Controls Which Bulb. All Lights Are Initially Off, And You Cannot See Into One Room From The Other. You Can Check The Room Only Once. How Can You Determine Which Switch Is Connected To Which Light Bulb? |
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Answer» Call the SWITCHES 1, 2, and 3. Leave Switch 1 off. Turn Switch 2 on for FIVE minutes and then turn it off. Turn Switch 3 on and leave it on. Enter the room. The BULB that is on is controlled by Switch 3 (the one you left on). Feel the light bulbs that are off for heat. The bulb that is off and warm is controlled by Switch 2 (the one you turned on, then off). The bulb that is off and COLD is controlled by Switch 1 (the one that you didn't turn on). Call the switches 1, 2, and 3. Leave Switch 1 off. Turn Switch 2 on for five minutes and then turn it off. Turn Switch 3 on and leave it on. Enter the room. The bulb that is on is controlled by Switch 3 (the one you left on). Feel the light bulbs that are off for heat. The bulb that is off and warm is controlled by Switch 2 (the one you turned on, then off). The bulb that is off and cold is controlled by Switch 1 (the one that you didn't turn on). |
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