008,1/3是错误的答案,正确的是1/2
所有跟贴·加跟贴·新语丝读书论坛
送交者: HunHunSheng 于 2008-07-31, 15:36:51:
已给的条件应该加上电话上能听到的是男孩. There is no abstract way to aquire the infor that at least one child
amiong two childrens is a boy
所有跟贴:
- 你把话说清楚了。 - JFF (468 bytes) 2008-07-31, 16:56:02 (246900)
加跟贴