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Interview puzzle with answers | 3 bulbs and 3 switches - YouTube
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Alternative solution to the three lightbulbs riddle. : r/riddles
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the 3 light bulbs puzzle - YouTube
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Riddle Me This: Three Light Bulbs and Three Switches - PEimpact - Recognizing the impact of PEs
Interview puzzle with answers | 3 bulbs and 3 switches - YouTube
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3 Bulbs and 3 Switches Puzzle - YouTube
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A bright idea | plus.maths.org
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