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Twenty people are seated around a circular table. Each person is either a knight, who always tells the truth, or a knave, who always lies. If each person at the table says, “The person on my right is a knave,” how many knaves are seated around the table?

 May 30, 2020
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They must alternate knight, knave, knight, knave, ...etc.  So there are 10 knaves.

 May 30, 2020

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