題目網址: https://www.puzzleup.com/2020/ https://www.puzzleup.com/2020/puzzle/?1 答題時限: 11月５日７ＰＭ－比賽結束（約12月30日） 加分時限: 11月５日７ＰＭ－11月10日６：５９ＰＭ 答對可得基本分１００分。答案可上傳５次，每改１次答案從基本分扣２０分。　 比賽期間內可隨時上傳答案，加分時限內答對第ｎ天加（６－ｎ）分　 　　 　　 另依題目的難易有額外加分（如有８０％的人這題答錯，答對者加８０分）　　 ◆TETRAHEDRON TRAVEL https://www.puzzleup.com/2020/img/puzzle/2020/01.jpg You will make a travel through the edges of two tetrahedrons (ABCD, and CDEF) joined as shown in the figure. - You will start on A, and finish on F. - You can visit the vertices more than once except the finishing vertex F. - You can't pass through the edges more than once. In how many different ways can this travel be done? Note: Two travels having same edges in different order will be considered as different. 你將從上圖這兩個正四面體 (ABCD 及 CDEF) 在一個邊相接的圖形的邊上進行移動。 - 路線從 A 開始，到 F 結束。 - 除了 F 之外的任一頂點皆可以經過多於一次。 - 任一條邊不能經過多於一次。 試問如此的移動有多少種不同的走法？ 注意: 兩個走法若僅是經過的邊順序不同依然視為不同走法。 ==== 第一題是個舊題形回顧, 之前出在 2015 Q9 和 2016 Q10 那因為同樣幾乎一字不改我就把舊翻譯拿來用了 XD -- 'You've sort of made up for it tonight,' said Harry. 'Getting the sword. Finishing the Horcrux. Saving my life.' 'That makes me sound a lot cooler then I was,' Ron mumbled. 'Stuff like that always sounds cooler then it really was,' said Harry. 'I've been trying to tell you that for years.' -- Harry Potter and the Deathly Hollows, P.308 --

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