I actually "solved" it in less than 2min

rx300 · 2012-12-28 19:07:24Z

I actually "solved" it in less than 2min简介

来源: rx300 于 2012-12-28 19:07:24 [档案] [旧帖] [给我悄悄话] 阅读数 : (209 bytes)

回答: yes. Sorry. Should be 由 392 于 2012-12-28 18:55:30

I found this.

http://math.stackexchange.com/questions/261826/what-is-three-different-way-to-solve-this-probability-combinatorics-problem-of

刚开始以为您又要搞脑筋急转弯，故意把d改成了?d.

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• well, I should have said no googling -392- ♂ (138 bytes) () 12/28/2012 postreply 19:15:15