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回复：世界大学生奥赛题：坐飞机（2.5星）

jjmmjj 2009-07-03 06:30:33 ( reads)

=1/50*(1/50+1/49+....+1/2+1/1)

跟帖(2)

jjmmjj

2009-07-09 18:55:19

correction

jjmmjj

2009-07-09 18:57:05

(49/50 + 1/50/50) * (48/49 + 1/49/49) ....*(1/2 + 1/2/2)