Can you solve the dragon jousting riddle? - Alex Gendler

2,686,917 views ・ 2020-01-09

TED-Ed


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譯者: Wei-Chia Huang 審譯者: H_L Au
00:06
After centuries of war,
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歷經數百年戰爭後,
00:08
the world’s kingdoms have come to an agreement.
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世界各王國達成了協議。
00:11
Every five years, teams representing the elves, goblins, and treefolk
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每五年,精靈、小妖精 與樹人的代表隊伍
00:17
will compete in a grand tournament of dragon jousting.
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將進行一場盛大的龍上長槍比武。
00:21
Every team will face each of the others once.
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每隊只會和其他隊伍各比一次。
00:25
The kingdom whose team wins the most matches will rule all of Center-Realm
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代表隊贏得最多場比賽的王國 就可以統治整個中心領域
00:30
until the next tournament.
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直至下次比賽。
00:31
To prevent any outside meddling,
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為了防止任何外部干預,
00:34
the games are to be conducted in absolute secret
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比賽必須絕對秘密地進行,
00:37
except for a group of wizards who will make sure
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只有巫師團例外,他們要確保
00:40
nobody uses enchantments, hexes, or spells to cheat.
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沒人能利用魔法、 妖術或咒語作弊。
00:45
You’ve been given the extremely important job of recording the scores
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你被賦予了極其重要的任務,
00:49
for the first inaugural tournament.
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便是為首屆賽事記錄比分。
00:51
But the opening celebrations get a bit out of control,
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但開幕慶典卻有點失控了,
00:55
and when you wake up,
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你醒來時,
00:56
you realize the games are already underway.
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發現競賽早就開始了。
00:59
Fortunately, no one has noticed your absence so far.
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幸好,到現在還沒人發現你不在。
01:03
However, you need to get up to speed quickly;
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不過,你得趕緊起來。
01:06
if your boss, the head tournament official,
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若你的上司, 也就是比武的首席官方人員
01:09
finds out you’ve been sleeping on the job, you’ll lose your head.
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發現你居然曠工睡著了, 你就死定了。
01:13
After weighing your options,
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權衡之下,
01:15
you decide to offer your life’s savings to one of the regulation wizards
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你決定把畢生積蓄 給其中一位執法巫師
01:19
in return for the information,
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以此換取情報,
01:21
giving him your blank scorecard to fill out.
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讓他填上你給的空白記分卡。
01:24
But before he can finish, your boss walks into the tent.
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可在他完成前, 你的上級走進了帳篷。
01:28
You barely manage to hide the scorecard in time,
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你根本來不及藏好記分卡,
01:31
and the wizard excuses himself.
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巫師也為自己開脫。
01:33
Your boss chuckles.
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你的上司輕笑。
01:35
“Hope you didn’t believe anything Gorbak’s been saying—
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「希望你沒信戈巴克說的任何話,
01:37
he’s been cursed to tell only lies, even in writing.
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他受了只能說謊的詛咒, 哪怕用寫的也一樣。
01:41
Anyway, can you believe how low-scoring the tournament’s been?
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無論如何,你相信 這次比賽的得分有多低嗎?
01:45
Every team has played at least once,
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所有隊伍至少都比過一遍了,
01:47
yet not a single match with a combined score of more than five hits!
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卻沒一場比賽的總分超過五分!
01:51
Anyhow, I’ll be back in a minute to review your scorecard.”
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總之,我一分鐘後會回來 檢查你的計分卡。」
01:55
You laugh along,
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你跟著笑,
01:56
and when he leaves you look at the partially completed card,
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他離開後你看向半完成的計分卡,
01:59
now knowing every single number on it is wrong.
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如今你得悉上面的數字都是錯的。
02:03
You’ve only got one chance to save yourself,
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你只有一次救自己的機會,
02:06
so what’s the real score of each match?
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到底每場比賽的實際比分是什麼?
02:09
Pause now to figure it out for yourself.
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[現在暫停一下自己好好想想。]
02:17
The incredible thing about this riddle is that you can reach the solution
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這個謎題的精妙之處在於
你能在幾乎毫無正確資訊的情況下 解開答案。
02:20
despite an almost complete lack of correct information.
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02:24
And that’s possible because knowing that something is false
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這是有可能的, 因為知道何者為非
02:28
is meaningful information in its own right.
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本身便是有意義的資訊。
02:31
The first key is to realize that no team will play more than two matches,
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第一個關鍵是 知道沒有隊伍比超過兩場,
02:36
since there are only two other teams.
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因為總共只有三個隊伍。
02:39
So if the elves didn’t actually play one match,
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所以若精靈隊實際並非比了一場,
02:42
and the goblins didn’t actually play two,
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妖精隊比賽次數也非兩場,
02:44
the truth must be that elves played two and goblins played one.
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事實必定是精靈比了兩場, 而小妖精則是一場。
02:49
For the elves to have played two matches,
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既然精靈比了兩次,
02:51
they must’ve faced each of the other teams once.
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他們一定和其他隊伍各比過一次。
02:55
And since goblins have only played one match so far— against the elves—
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若小妖精目前只和精靈比了一次,
02:59
that means the match between goblins and treefolk has not occurred yet.
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就代表小妖精和樹人還沒比賽過。
03:04
We know it’s false that the treefolk tied zero matches,
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我們知道樹人隊 平局為零的資訊是錯的,
03:08
which means their bout against the elves must’ve tied.
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就表示他們與精靈一戰是平手。
03:11
We also know that the elves won at least one match,
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我們也知道精靈贏了至少一次,
03:14
and since they tied against the treefolk, they must have beaten the goblins.
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既然他們和樹人是平手, 就一定打敗了小妖精。
03:19
But can we figure out the actual scores?
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但我們能得出實際分數嗎?
03:22
Let’s start with the elf-treefolk tie.
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先從精靈對樹人的平局開始吧。
03:25
Because no more than five total hits were scored,
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由於每局總分不超過五分,
03:28
the final tally must’ve been 0-0, 1-1, or 2-2.
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最終比分應該是 0 比 0、 1 比 1 或 2 比 2。
03:33
But the treefolk must’ve scored some hits,
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但樹人一定有得到些比分,
03:36
and it’s false that they only had one hit scored against them.
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且他們只贏一分的資訊是假的。
03:39
The only option that leaves is 2-2.
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剩下的唯一答案 就是 2 比 2 。
03:43
In the match between elves and goblins,
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精靈對小妖精一戰中,
03:45
the goblins must’ve scored at least one hit.
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小妖精一定至少贏了一分。
03:48
And the elf score must be 2 or more for them to have won the match.
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而精靈隊必定是 得兩分以上才會勝利。
03:53
This leaves only a few possibilities that add up to 5 or less.
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等於或小於 5 分就 只剩下幾種可能。
03:57
The elves couldn’t have scored three, so that eliminates these two.
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精靈隊不可能得 3 分, 所以排除這兩種可能。
04:01
And their total hits scored across both matches can’t add up to six,
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他們兩場的總得分不可能為 6,
04:06
so this one’s out too.
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所以這個也不對。
04:08
So the score must’ve been 2-1.
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所以比分一定是 2 比 1。
04:12
With one match remaining,
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接下來就剩一場比賽了,
04:13
you’ve managed to save your job— and your neck.
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你成功保住工作──和你的腦袋。
04:16
Gorbak the wizard may have lied,
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巫師戈巴克可能真的撒了謊,
04:18
but your deductive skills quickly evened the score.
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但你用推理技巧迅速得出了分數。
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