斑竹可以算算邻居两个小孩至少有一个是男孩两个都是男孩的概率是多少

送交者: HunHunSheng 于 2008-03-03, 15:38:44:

Solution one:

One is a boy. So the other child has 50% of chance to be also a boy. So the answer is 50%

Solution two:

BB, BG, GB, GG each is equally liekly so each is 25%.

Prob(BB|BB,BG,GB)=1/3.

How come you can have two different answers?

胡闹,只有Solution one是正确的啊 (无内容) - 找老婆专用ID (0 bytes) 2008-03-04, 00:30:46 (209720)
也就是说为什么两个孩子的前提下 - HunHunSheng (55 bytes) 2008-03-03, 15:41:50 (209651)
- 这个问题对版主还有点意义，因为遗传学要用 (无内容) - xinku (0 bytes) 2008-03-03, 15:48:40 (209654)
  - 对语言学也有意义 (无内容) - HunHunSheng (0 bytes) 2008-03-03, 15:54:20 (209657)