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三个红色和两个黑色公仔箱論壇9 b" t+ @" C/ y( e. J0 e9 z, w

8 F% E% h2 ^+ D公仔箱論壇最后那个说我不知道我戴什么颜色帽子.5.39.217.760 `) i5 F) X3 }  r
- the front #1 , #2 must not be black/black.  Otherwise, #3 will know he is red.  #1/#2 must be red/red or red/black or black/red.
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中间那个说我也不知道我戴什么颜色帽子.5 I  `7 y5 a8 L/ L" |) t" z# I' L
- for #2, if he see #1 wearing black, he can be sure he is red.  since #2 cannot be sure, then #1 must NOT be wearing black.公仔箱論壇, J/ d$ P/ b2 M1 D
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但是第一个说我知道我戴什么颜色帽子.5.39.217.76) _  e8 c. L: P3 q9 W
- #1 must be wearing RED