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There are three light switches outside a room and one lamp inside.
You can enter once. How do you find the lamp’s switch?
Answer
Turn on #1, wait, turn it off; turn on #2; enter—on = #2, warm off = #1, cold off = #3
Explanation
Use heat test: on #1 then off; #2 on; enter—on = #2, warm off = #1, cold off = #3.
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