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The teacher called together the three most proud of his students and wanted to test their intelligence. He first let the three students stand in front and back, and then took out three white and two black hats, so that after the students saw it, they hid the two black hats and put them on them. None of the three students could see the hat they were wearing, but the one behind could see the front, and the front could not see the back. The teacher asked the three students to say the color of the hat they were wearing. After a period of thinking, the former student replied: I am wearing white. How did he know?

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