View full lesson: http://ed.ted.com/lessons/can-you-solve-the-three-gods-riddle-alex-gendler

You and your team have crash-landed on an ancient planet. Can you appease the three alien overlords who rule it and get your team safely home? Created by logician Raymond Smullyan, and popularized by his colleague George Boolos, this riddle has been called the hardest logic puzzle ever. Alex Gendler shows how to solve it.

Lesson by Alex Gendler, animation by Artrake Studio.

36 thoughts on “Can you solve the three gods riddle? – Alex Gendler

  1. "If I ask you if it's a long way back to earth would you answer ozo? He says ozo. He answered the same as in the question. This means it is a long way. If ozo means yes, imagine the question. "If I ask you if it's a long way back to earth would you answer yes? He says yes. If ozo means no, imagine the question.If I ask you if it's a long way back to earth would you answer no? He says no. So it is a long way back.

  2. Just give them the three artifacts and ask them to pick the right one for each of them. If they reject that, you would know what "no" means.

  3. trying to figure this out, would something like "what would x say if i asked him this question" be considered a yes or no question? it only has two responses, but its not directly saying an affirmative or negative statement.

  4. "You know the language enough to ask several questions, but you don't know if 'Ozo' means 'yes' or 'no'."
    KIDS THIS IS WHAT HAPPENS WHEN YOU DON'T STUDY.
    Also, isn't it easy to remember which is which?

  5. Guys , if the middle one answers ozo ,then there's equal probability of that overlord being all three of them because arr can also tell ozo as ans (because he can lie too) since we get only ozo as ans ntg else so we can't deduce who is who , we can only solve problem if the middle overlord is not arr

  6. When you asked the alien in the middle if the one on left is Arr … you assumed that you already know somehow that ozo means true. But you don't know that in the question. So the answer given doesn't work.

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