What Color Is the Dragon?

red dragon.jpg

Credit: Antonio J. Manzanedo

Two knights encounter a dragon, who quickly responds, “I am protected by the king’s decree.” Gray rational dragons and red predator dragons always tell the truth; red rational dragons and gray predator dragons always lie.

What color is the dragon?

Solution

This is a puzzle from Norman D. Willis’ Challenging False Logic Puzzles (1997).

To answer this question, you must first consider what would be the color of the dragon if he is lying or telling the truth. This is easy since the problem fully supplied this information. Based on this fact, it can be determined that if the dragon is telling the truth, he is a gray rational; if he is lying, he is a gray predator. So, the answer to the question is: The dragon is gray.

 

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My name Edmark M. Law. I work as a freelance writer, mainly writing about science and mathematics. I am an ardent hobbyist. I like to read, solve puzzles, play chess, make origami and play basketball. In addition, I dabble in magic, particularly card magic and other sleight-of-hand type magic. I live in Hong Kong. You can find me on Twitter` and Facebook. My email is edmarklaw@learnfunfacts.com

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