There are 4 children in one room, 2 wearing black hats and 2 wearing white hats,
There are 4 children in one room, 2 wearing black hats and 2 wearing white hats, but everyone does not know what color hat they wear, as shown in the figure, there is a wall between A and B, C, D, so Can't see, no one can take off the hat and can't look back. After a moment of silence, one of the four children guessed the color of the hat he was wearing. Who guessed it? why?
Published Date：10/27/2018 12:58:57 PM From：Facebook
