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I was asked a boolean logic riddle: You are walking and arrive at a dead end with 2 doors. You must get past this, but you are told that only one door is correct, leading you on your path and the other door is not correct and leads to something perilous. In front of each door is a guard. One guard always tells the truth and the other always lies. You may ask one of the guards one question, and then you must pick your door and go through it. What question do you ask, which door do you pick based on the answer, and why? This is actually not that hard once you realize that it's a boolean algebra problem, but I was surprised that I was asked that question.
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Software Engineer III

Interviewed at Cisco

4.1★
Dec 14, 2013

I was asked a boolean logic riddle: You are walking and arrive at a dead end with 2 doors. You must get past this, but you are told that only one door is correct, leading you on your path and the other door is not correct and leads to something perilous. In front of each door is a guard. One guard always tells the truth and the other always lies. You may ask one of the guards one question, and then you must pick your door and go through it. What question do you ask, which door do you pick based on the answer, and why? This is actually not that hard once you realize that it's a boolean algebra problem, but I was surprised that I was asked that question.

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