The back man can see the hats worn by the two men in front of him. So, if both of those hats were white, he would know that the hat he wore was black.
最后面的人能看到前面两个人的帽子，如果前面两个的帽子颜色都是白色，那他知道他的帽子颜色是黑色。
The back man can see the hats worn by the two men in front of him. So, if both of those hats were white, he would know that the hat he wore was black.
最后面的人能看到前面两个人的帽子，如果前面两个的帽子颜色都是白色，那他知道他的帽子颜色是黑色。
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