my answer: 39/64


1-[1-(1-(1/2)(1/2))(1/2)]^2 = 39/64

所有跟帖: 

formula are ...,the denometer can't be 64. -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 06/19/2010 postreply 19:25:24

correct -wfmi- 给 wfmi 发送悄悄话 wfmi 的博客首页 (0 bytes) () 06/28/2010 postreply 11:48:50

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