送交者: Independent 于 2006-12-11, 06:45:49:

回答: 5把钥匙的环型钥匙串上加两把钥匙,问这两把钥匙相邻的概率 由 lanzhongdan 于 2006-12-11, 02:25:08:

• 1/3=6把钥匙加一把，新钥匙与某一钥匙相邻的概率 (无内容) - Kurt (0 bytes) 2006-12-11, 07:10:49 (115185)
  • a much better solution than mine - qtl (29 bytes) 2006-12-11, 07:19:17 (115188)

加跟贴