I actually "solved" it in less than 2min

回答: yes. Sorry. Should be3922012-12-28 18:55:30

I found this.

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

剛開始以為您又要搞腦筋急轉彎,故意把d改成了?d.

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well, I should have said no googling -392- 給 392 發送悄悄話 392 的博客首頁 (138 bytes) () 12/28/2012 postreply 19:15:15

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