Since the guards are commanded to say the truth/lie every time, you can trick them with this cunning question.Grab a guard and ask ,"If I asked you what the other guard would say if I asked him if the door was safe, would you say yes?"
Its like "1X-1=-1"!The question cleverly combines both guards answers.Whichever guard and door you choose, the answer will always be the opposite of the truth!
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