The three students looked at each other, hesitated for a moment, and said in unison that they were wearing white hats.
Smart reader, think about it. How do they know the color of the hat? "In order to solve the above problems, let's first consider the problem of' two people 1 black hat and two white hats'. Because the black hat is only 1, as soon as I wear it, the other party will immediately say that he is wearing a white hat. But he hesitated for a moment, which showed that I was wearing a white hat.
In this way, the problem of "three people, two blacks and three whites" will be solved. If I wear a black hat, the two of them will become a question of "1 two people with black hats and two people with white hats". They can answer it right away, but they all hesitated for a while, which means that I wear a white hat and all three of them have gone through the same thinking, so they all think it over. Students may clap their hands and say it is wonderful. Grandpa who came to China later complicated the original problem. How to solve the problem of "n people, n- 1 black hat and several (not less than n) white hats"? In the same way, it is easy to solve. He also warned us that being good at "retreating" complex problems, "retreating enough" and retreating to the most primitive place without losing importance are the secrets of learning mathematics well.
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