回复：If you are right,it shoul be from real data.P(b)=13/27

I believe this is the ‘expected’ answer to this question. You can always argue that the question was not soundly stated though (though actually it is generally soundly stated).

13/27 is a right answer

1/3 could be a right answer…

½ could be a right answer …

要真正完全理解这道题，

1- 应明白这三个答案的来龙去脉
2- 你应可以扩展或改写题目，create a scenario/story/question that make 1/3 and ½ correct.

所有跟帖： 

• You want to creat a new fuzzy, or fussy Math.? -jinjing- ♀ (16 bytes) () 05/28/2010 postreply 13:56:40

• Come on man... -naeconi- ♂ (1311 bytes) () 05/28/2010 postreply 14:29:52

• An most importantly, why is the day of birth relevant? -naeconi- ♂ (0 bytes) () 05/28/2010 postreply 14:38:53

• 回复：Come on man... -guest007- ♀ (115 bytes) () 05/28/2010 postreply 17:33:20

• No I don't. Could you explain? -naeconi- ♂ (0 bytes) () 06/01/2010 postreply 07:28:15

• Never mind. Got it. -naeconi- ♂ (0 bytes) () 06/01/2010 postreply 07:35:18

• 回复：Never mind. Got it. -guest007- ♀ (3 bytes) () 06/02/2010 postreply 07:35:56

• Also, can you confirm my understading of 13/27? -naeconi- ♂ (0 bytes) () 06/01/2010 postreply 07:29:01