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.! P }. x. g! Y) T4 c
- 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.
% N+ M, V+ m' t5 B7 o# W# w' k- 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.
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但是第一个说我知道我戴什么颜色帽子.0 x6 K1 A6 M* N: z L+ k
- #1 must be wearing RED |
發表於 2008-12-3 10:06 AM
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