5. “蓝额头房间”解密

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Blue Forehead Room Solution

So we had the hundred logicians.

All of their foreheads were painted blue.

And before they entered the room,

they were told that at least one of you hundred logicians

has your forehead painted blue.

And then every time that they turned on the lights,

so that they could see each other, they said OK, once you've

determined that you have a blue forehead,

when the lights get turned off again, we want you to leave the room.

And then once that's kind of settled down,

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