You are correct.

来源: ManYou 于 2010-06-30 17:13:45 [] [旧帖] [给我悄悄话] 阅读数 : (4 bytes)
回答: It should be: (1/2+1/4+1/8)*(1/2+1/4)=21/32 由 ManYou 于 2010-06-19 10:40:08

_:$

所有跟帖： 

• It got to same anwser: (1/2+1/4+1/8)*(1/2+1/4)*4/6=7/16 -ManYou- ♂ 给 ManYou 发送悄悄话 (0 bytes) () 06/30/2010 postreply 18:41:37

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