三个红色和两个黑色4 |) Y1 j8 V) f# ]3 b+ p" Y4 {3 j
# @5 \) L7 I) U8 d" D5 |3 j, ktvb now,tvbnow,bttvb最后那个说我不知道我戴什么颜色帽子.
( i' i" E. d0 B# i! y- 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.
+ R, B c# V+ t! p* j" z i
- G. }: C0 r& I6 T) d中间那个说我也不知道我戴什么颜色帽子.
" ]6 a; f) C8 {" U- 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. o0 h0 X7 P3 M' J/ r
9 }: v0 J$ ^' f3 D2 p. w* d6 I但是第一个说我知道我戴什么颜色帽子.
" w8 V2 f, Y5 utvb now,tvbnow,bttvb- #1 must be wearing RED |
發表於 2008-12-3 10:06 AM
| 
