三个红色和两个黑色$ y8 a* |$ H: X. i$ f8 S! H
5.39.217.77:8898; p: u/ V* D# S+ j- C9 h- x M
最后那个说我不知道我戴什么颜色帽子.
& D; z5 t4 C' U* 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.
+ k. _2 O' A! @; e# z# ~ N5 p
' g+ n' _7 ^( k- G8 l中间那个说我也不知道我戴什么颜色帽子.! k" `) _ w$ Z9 ~/ 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.9 \, ]7 w( z2 a$ i3 T: v- Q( w
0 t6 X9 p1 B8 |9 G但是第一个说我知道我戴什么颜色帽子.tvb now,tvbnow,bttvb* X: k: v, F) ^2 J. o$ G8 P+ ?' ]
- #1 must be wearing RED |
發表於 2008-12-3 10:06 AM
| 
