1×C(7,2)+2×C(6,2)+3×C(5,2)+4×C(4,2)+5×C(3,2)+6×C(2,2)
這個雖然case多了一點,但比我的簡單。
本文內容已被 [ sweetptt ] 在 2012-12-29 08:22:18 編輯過。如有問題,請報告版主或論壇管理刪除.
1×C(7,2)+2×C(6,2)+3×C(5,2)+4×C(4,2)+5×C(3,2)+6×C(2,2)
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