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find the switch ?

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There are three switches downstairs. Each corresponds to one of the three light bulbs in the attic. You can turn the switches on and off and leave them in any position.
How would you identify which switch corresponds to which light bulb, if you are only allowed one trip upstairs?

posted Apr 11, 2019 by anonymous

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1 Answer

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  1. number the switches
  2. switch one of them on, lets say number 1
  3. wait for 5-10 mins, switch the number 1 off and switch the number 2 on and
  4. go upstairs and check the temperature of the bulbs off- cold one is number 3, warm one is number 1, the one which is still on- is number 2
answer Apr 11, 2019 by Hanifa Mammadov

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