I actually "solved" it in less than 2min

rx300 · 2012-12-28 19:07:24Z

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

來源: rx300 於 2012-12-28 19:07:24 [檔案] [舊帖] [給我悄悄話] 本文已被閱讀：次 (209 bytes)

本文內容已被 [ rx300 ] 在 2012-12-29 08:24:06 編輯過。如有問題，請報告版主或論壇管理刪除.

回答: yes. Sorry. Should be 由 392 於 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

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- ♂ (138 bytes) () 12/28/2012 postreply 19:15:15

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