[spoiler=dont read if you dont know becase its the right thing]Turn switch #1 on, turn switch #2 on for 15-20 minutes and play solitaire, then turn it off, and leave switch #3 alone. The #1 bulb will be on, the #2 will be off but hot, and the #3 will be off and cold.[/spoiler]
Spoiler : dont read if you dont know becase its the right thing :Turn switch #1 on, turn switch #2 on for 15-20 minutes and play solitaire, then turn it off, and leave switch #3 alone. The #1 bulb will be on, the #2 will be off but hot, and the #3 will be off and cold.
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