13/27

回答: 1/3endofsuburbia2010-05-27 08:52:45

P(E/F)=(13/196)/(27/196)=13/27

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:) now you can explain 康妹妹的题 to naeconi -guest007- 给 guest007 发送悄悄话 (2 bytes) () 05/28/2010 postreply 19:29:11

You and I are wrong -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 05/29/2010 postreply 18:21:31

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