[中譯] Puzzleup 2017 (14) Dice Game

[LPH66 (かつて交わした約束)]

題目網址: http://www.puzzleup.com/2017/
          http://www.puzzleup.com/2017/puzzle/?14
答題時限: 11月９日７ＰＭ－比賽結束（約12月27日）
加分時限: 11月９日７ＰＭ－11月14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）　　  

◆DICE GAME

You will play a game of chance with your friend by throwing a dice repeatedly.

* Whenever 4 even numbers appear in a row, you will win.
* Whenever 4 odd numbers appear in a row, your friend will win.
* Whenever 5 even numbers appear (may not be in a row), your friend will win.
* If first and third condition occur at the same time, first condititon has
the priority.

What is your probability of winning the game?

(Enter your answer as a reduced fraction. Example: 123/4567)

你和你的朋友玩一個遊戲, 重覆投擲一個骰子。

* 如果連續出現四個偶數, 你贏。
* 如果連續出現四個奇數, 你的朋友贏。
* 如果出現過五個偶數 (不一定連續), 你的朋友贏。
* 若第一和第三個條件同時滿足, 第一個條件優先。

試問你贏的機率為何?

(以最簡分數回答，如 123/4567。)

--
  '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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※ 文章網址: https://www.ptt.cc/bbs/puzzle/M.1510271096.A.45B.html
→ newacc: 怎麼覺得這題直接窮舉就好@@
→ ACGfans: 我也是用窮舉 20場就夠了
推 cutekid: 11 場 is ok
→ buffalobill: 我舉了16場……疑？
推 adrianshum: 要窮舉20場吧。最壞的情況，要oooeoooeoooeoooeoooe
→ adrianshum:  共20 場才能分勝負
→ adrianshum: 我錯了orz
→ adrianshum: 的確是11 場