你把话说清楚了。

送交者: JFF 于 2008-07-31, 16:56:02:

回答: 008,1/3是错误的答案,正确的是1/2 由 HunHunSheng 于 2008-07-31, 15:36:51:

“Scenario 2: One day you make a phone call to him and
he said only he and his two children are at home. You
hear some boy's voice among backgroudn noise.”

难道这不是说这boy's voice among backgroudn noise　来自“his two children are at home　”？
否则，给你INFO有什么用？

退一步讲，如果认为这boy's voice among backgroudn noise　是来自“his two children are at home　”，那么1/3是正确的答案，对吧。

http://www.xys.org/forum/db/3/188/41.html

所有跟贴:

那么你的解答是什么? (无内容) - HunHunSheng (0 bytes) 2008-07-31, 19:13:42 (246921)
- 先让我严重声明一下，我是把这当概率论题目，而不是福尔摩斯案例来看待的。 - JFF (1085 bytes) 2008-07-31, 21:56:06 (246946)
用直觉知道1/3 不对. 应该是1/2 or 2/3.　 (无内容) - 湘女 (0 bytes) 2008-07-31, 17:23:09 (246904)
- feel right (无内容) - whoami (0 bytes) 2008-07-31, 19:24:35 (246924)

加跟贴