答案13/27是我重新算得的。我再得不出其他的答案了。
我也不希望如此。可是,
所有跟帖:
• 2)27/196,有1/2一男一女,1/4二男,1/4二女. -jinjing- ♀ (126 bytes) () 02/09/2011 postreply 12:28:01
• 2)27/196,有1/2一男一女,1/4二男,1/4二女. -jinjing- ♀ (126 bytes) () 02/09/2011 postreply 12:28:01
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