abcnow

三个红色和两个黑色
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最后那个说我不知道我戴什么颜色帽子.3 l9 D: P7 k. ]- l- T7 N
- 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.1 B9 P0 S/ E% K
tvb now,tvbnow,bttvb2 n( h9 B2 Q' i2 X* ?6 J
中间那个说我也不知道我戴什么颜色帽子.www3.tvboxnow.com/ X% C' x" H( I& p9 p6 ?: Z5 M
- 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.# r7 P+ P3 d4 H1 x

4 q$ [/ o8 G0 ^: s9 k$ Z$ \www3.tvboxnow.com但是第一个说我知道我戴什么颜色帽子.www3.tvboxnow.com* [; p1 R) M# ^3 J. f
- #1 must be wearing RED