三个红色和两个黑色' X9 O1 \3 g, A5 O* W/ m
2 C C7 Y1 O5 J最后那个说我不知道我戴什么颜色帽子.
3 S( r r1 } i$ k8 V6 S, |/ P% Itvboxnow.com- 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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1 u y5 {3 {6 U# Q! b, Q- B' xtvboxnow.com中间那个说我也不知道我戴什么颜色帽子.& T' t2 j5 G4 F) q+ C
- 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.
4 |( e6 l5 H* e B+ V9 o5 H# _- #1 must be wearing RED |
發表於 2008-12-3 10:06 AM
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