Logic save the world

Logic Level 1

An ailen is either truth teller or liar. Truth tellers always tell the truth, and liars always lie. In one day, you found that the ailens want to use their atomic bombs to attack the Earth. You take your spaceship and defeat them, but the missle is launching in 30 minutes later. There is two button :one to stop the missle, and the other is to launch it. A double agent ailen is in there, but you don't know he is a truth teller or a liar. You can ask only a question and the ailen answer. Can you make sure that you will save the world?

No Yes

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1 solution

Phuc Trung
Jul 17, 2018

Yes, just ask "If I asked you which buttons is to stop the missle, what button would you say? If he is a truth teller,they will tell the right button. If he is a liar,he will tell you the wrong one, but he must lie about this and tell you the right. THE END

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