Can you solve the locker riddle? - Lisa Winer

11,826,206 views ・ 2016-03-28

TED-Ed


μ•„λž˜ μ˜λ¬Έμžλ§‰μ„ λ”λΈ”ν΄λ¦­ν•˜μ‹œλ©΄ μ˜μƒμ΄ μž¬μƒλ©λ‹ˆλ‹€.

λ²ˆμ—­: Nahn Ju Kim κ²€ν† : Jihyeon J. Kim
00:06
Your rich, eccentric uncle just passed away,
0
6720
3634
μ—¬λŸ¬λΆ„μ˜ λΆ€μž 괴짜 μ‚Όμ΄Œμ΄ 막 λŒμ•„κ°€μ…¨μ–΄μš”.
00:10
and you and your 99 nasty relatives have been invited to the reading of his will.
1
10354
6500
μœ μ–Έμ„ κ³΅κ°œν•˜λŠ” λ‚  λͺ»λœ μΉœμ²™ 99λͺ…κ³Ό ν•¨κ»˜ μ΄ˆλŒ€λμ£ 
00:16
He wanted to leave all of his money to you,
2
16854
2520
μ‚Όμ΄Œμ€ λͺ¨λ“  μž¬μ‚°μ„ μ—¬λŸ¬λΆ„μ—κ²Œ 남기고 μ‹Άμ—ˆμ§€λ§Œ
00:19
but he knew that if he did, your relatives would pester you forever.
3
19374
5431
κ·Έλž¬λ‹€κ°„ μΉœμ²™λ“€μ΄ 평생 κ΄΄λ‘­νžˆλ¦¬λž€ κ±Έ μ•Œμ•˜μ–΄μš”.
00:24
So he is banking on the fact
4
24805
2257
κ·Έλž˜μ„œ μ‚Όμ΄Œμ€ μ—¬λŸ¬λΆ„μ—κ²Œ
00:27
that he taught you everything you need to know about riddles.
5
27062
5598
μˆ˜μˆ˜κ»˜λΌμ— κ΄€ν•œ λͺ¨λ“  κ±Έ κ°€λ₯΄μ³€λ‹¨ 점을 μ΄μš©ν•˜κΈ°λ‘œ ν–ˆμ–΄μš”.
00:32
Your uncle left the following note in his will:
6
32660
2898
μ‚Όμ΄Œμ€ μœ μ–Έμž₯에 이런 말을 λ‚¨κ²ΌμŠ΅λ‹ˆλ‹€.
00:35
"I have created a puzzle.
7
35558
2219
"λ‚΄κ°€ 퍼즐을 ν•˜λ‚˜ λ§Œλ“€μ—ˆλ‹€.
00:37
If all 100 of you answer it together, you will share the money evenly.
8
37777
4251
100λͺ…이 ν•¨κ»˜ 닡을 찾으면 λˆμ„ λ˜‘κ°™μ΄ λ‚˜λˆ„κ² μ§€λ§Œ
00:42
However, if you are the first to find the pattern and solve the problem
9
42028
4157
λͺ¨λ‘κ°€ 움직이기 전에 λˆ„κ΅°κ°€κ°€ λ¨Όμ €
00:46
without going through all of the leg work,
10
46185
2536
κ·œμΉ™μ„ λ°œκ²¬ν•˜κ³  문제λ₯Ό ν’€λ©΄
00:48
you will get the entire inheritance all to yourself.
11
48721
3800
λͺ¨λ“  μœ μ‚°μ„ 혼자 κ°€μ§ˆ 것이닀.
00:52
Good luck."
12
52521
1577
μ—΄μ‹¬νžˆ 해보도둝."
00:54
The lawyer takes you and your 99 relatives to a secret room in the mansion
13
54098
4831
λ³€ν˜Έμ‚¬κ°€ μ—¬λŸ¬λΆ„κ³Ό 99λͺ…μ˜ μΉœμ²™μ„ 데렀간 μ €νƒμ˜ λΉ„λ°€μ˜ λ°©μ—λŠ”
00:58
that contains 100 lockers,
14
58929
2866
100개의 보관함이 있고
01:01
each hiding a single word.
15
61795
2475
κ±°κΈ°μ—” 단어가 ν•˜λ‚˜μ”© λ“€μ–΄μžˆμ–΄μš”.
01:04
He explains:
16
64270
1170
λ³€ν˜Έμ‚¬κ°€ μ„€λͺ…ν•˜κΈΈ
01:05
Every relative is assigned a number from 1 to 100.
17
65440
4365
λͺ¨λ“  μΉœμ²™μ—κ²Œ 1λΆ€ν„° 100 μ‚¬μ΄μ˜ 숫자λ₯Ό ν•˜λ‚˜μ”© 쀄 텐데
01:09
Heir 1 will open every locker.
18
69805
2900
1번이 λͺ¨λ“  보관함을 μ—΄λ©΄
01:12
Heir 2 will then close every second locker.
19
72705
3997
2λ²ˆμ€ λͺ¨λ“  두 번째 보관함을 λ‹«κ³ 
01:16
Heir 3 will change the status of every third locker,
20
76702
4177
3λ²ˆμ€ λͺ¨λ“  μ„Έ 번째 λ³΄κ΄€ν•¨μ˜ μƒνƒœλ₯Ό λ°”κΏ‰λ‹ˆλ‹€.
01:20
specifically if it's open, she'll close it,
21
80879
2896
μ—΄λ € 있으면 λ‹«κ³ 
01:23
but if it's closed, she'll open it.
22
83775
2805
λ‹«ν˜€ 있으면 μ—¬λŠ” κ±°μ£ .
01:26
This pattern will continue until all 100 of you have gone.
23
86580
4599
μ—¬λŸ¬λΆ„ 100λͺ…이 λͺ¨λ‘ 끝날 λ•ŒκΉŒμ§€ μ§€μ†ν•˜κ³  λ‚˜λ©΄
01:31
The words in the lockers that remain open at the end
24
91179
3283
λ§ˆμ§€λ§‰μ— μ—΄λ € μžˆλŠ” 보관함에 듀은 단어가
01:34
will help you crack the code for the safe.
25
94462
3575
금고 λΉ„λ°€λ²ˆν˜Έμ˜ 힌트λ₯Ό 쀄 κ²λ‹ˆλ‹€.
01:38
Before cousin Thaddeus can even start down the line,
26
98037
4607
μ‚¬μ΄Œ μ‚¬λ””μ–΄μŠ€κ°€ μΆœλ°œν•˜κΈ°λ„ 전에
01:42
you step forward and tell the lawyer you know which lockers will remain open.
27
102644
6368
μ—¬λŸ¬λΆ„μ€ λ³€ν˜Έμ‚¬ μ•žμœΌλ‘œ λ‚˜μ„œμ„œ μ—΄λ €μžˆμ„ 보관함 번호λ₯Ό μ•ˆλ‹€κ³  λ§ν•©λ‹ˆλ‹€
01:49
But how?
28
109012
2354
ν•˜μ§€λ§Œ μ–΄λ–»κ²Œ μ•Œμ•„λƒˆμ£ ?
01:51
Pause the video now if you want to figure it out for yourself!
29
111366
2966
μž μ‹œ μ˜μƒμ„ λ©ˆμΆ”κ³  닡을 생각해 λ³΄μ„Έμš”!
01:54
Answer in: 3
30
114332
1089
μ •λ‹΅ 곡개 3초 μ „
01:55
Answer in: 2
31
115421
1156
μ •λ‹΅ 곡개 2초 μ „
01:56
Answer in: 1
32
116577
1671
μ •λ‹΅ 곡개 1초 μ „
01:58
The key is realizing that the number of times a locker is touched
33
118248
3903
비결은 보관함을 κ±΄λ“œλ¦¬λŠ” νšŸμˆ˜κ°€
02:02
is the same as the number of factors in the locker number.
34
122151
4276
보관함 번호의 인수의 κ°œμˆ˜μ™€ κ°™λ‹€λŠ” κ±Έ μ•„λŠ” κ²λ‹ˆλ‹€.
02:06
For example, in locker #6,
35
126427
2637
예λ₯Ό λ“€μ–΄ 6번 보관함은
02:09
Person 1 will open it,
36
129064
1644
1번이 μ—΄κ³ 
02:10
Person 2 will close it,
37
130708
1894
2번이 λ‹«κ³ 
02:12
Person 3 will open it,
38
132602
1714
3번이 μ—΄κ³ 
02:14
and Person 6 will close it.
39
134316
2896
6번이 λ‹«μ£ .
02:17
The numbers 1, 2, 3, and 6 are the factors of 6.
40
137212
5120
숫자 1, 2, 3, 6은 6의 μΈμˆ˜μž…λ‹ˆλ‹€.
02:22
So when a locker has an even number of factors
41
142332
2833
즉, λ³΄κ΄€ν•¨μ˜ 인수의 κ°œμˆ˜κ°€ 짝수이면
02:25
it will remain closed,
42
145165
1647
λ‹«ν˜€ 있게 되고
02:26
and when it has an odd number of factors,
43
146812
2021
인수의 κ°œμˆ˜κ°€ ν™€μˆ˜μ΄λ©΄
02:28
it will remain open.
44
148833
2129
μ—΄λ €μžˆκ²Œ λ˜λŠ” κ±°μ£ .
02:30
Most of the lockers have an even number of factors,
45
150962
2991
λŒ€λΆ€λΆ„μ˜ 보관함은 인수의 κ°œμˆ˜κ°€ μ§μˆ˜μž…λ‹ˆλ‹€.
02:33
which makes sense because factors naturally pair up.
46
153953
3760
말이 되죠. μΈμˆ˜λŠ” 짝을 이루게 λ˜μ–΄ μžˆμœΌλ‹ˆκΉŒμš”.
02:37
In fact, the only lockers that have an odd number of factors
47
157713
3762
사싀 인수의 κ°œμˆ˜κ°€ ν™€μˆ˜μΈ 보관함은
02:41
are perfect squares
48
161475
2299
μ™„μ „μ œκ³±μˆ˜λΏμž…λ‹ˆλ‹€.
02:43
because those have one factor that when multiplied by itself equals the number.
49
163774
5178
ν•˜λ‚˜μ˜ 인수λ₯Ό μ œκ³±ν•΄μ„œ λ‚˜μ˜€λŠ” μˆ«μžλ‹ˆκΉŒμš”.
02:48
For Locker 9, 1 will open it,
50
168952
2382
9번 보관함은 1번이 μ—΄κ³ 
02:51
3 will close,
51
171334
1484
3번이 λ‹«κ³ 
02:52
and 9 will open it.
52
172818
2116
9번이 μ—½λ‹ˆλ‹€.
02:54
3 x 3 = 9,
53
174934
2160
3 κ³±ν•˜κΈ° 3은 9이죠.
02:57
but the 3 can only be counted once.
54
177094
2285
ν•˜μ§€λ§Œ 3은 ν•œ 번만 μ„Έμš”.
02:59
Therefore, every locker that is a perfect square will remain open.
55
179379
5150
λ”°λΌμ„œ μ™„μ „μ œκ³±μˆ˜μΈ λͺ¨λ“  보관함은 μ—΄λ € 있게 λ©λ‹ˆλ‹€.
03:04
You know that these ten lockers are the solution,
56
184529
2897
당신은 κ·Έ μ—΄ 개의 보관함이 λ‹΅μ΄λΌλŠ” κ±Έ μ•Œκ³ 
03:07
so you open them immediately and read the words inside:
57
187426
3859
λ°”λ‘œ μ—΄μ–΄μ„œ μ•ˆμ— μžˆλŠ” 단어듀을 λ΄…λ‹ˆλ‹€.
03:11
"The code is the first five lockers touched only twice."
58
191285
5758
"μ•”ν˜ΈλŠ” 두 번만 손 λŒ„ 보관함 쀑 μ•žμ˜ λ‹€μ„― κ°œμ΄λ‹€".
03:17
You realize that the only lockers touched twice have to be prime numbers
59
197043
4838
μ—¬λŸ¬λΆ„μ€ 두 번만 손 λŒ„ 보관함은 μ†Œμˆ˜μ—¬μ•Ό ν•œλ‹€λŠ” κ±Έ κΉ¨λ‹«μŠ΅λ‹ˆλ‹€.
03:21
since each only has two factors:
60
201881
2573
μ†Œμˆ˜λŠ” μΈμˆ˜κ°€ λ‘˜λΏμ΄λ‹ˆκΉŒμš”.
03:24
1 and itself.
61
204454
2054
1κ³Ό μžκΈ°μžμ‹ μ΄μ£ .
03:26
So the code is 2-3-5-7-11.
62
206508
4327
κ·Έλž˜μ„œ μ•”ν˜ΈλŠ” 2-3-5-7-11
03:30
The lawyer brings you to the safe,
63
210835
2374
λ³€ν˜Έμ‚¬κ°€ μ—¬λŸ¬λΆ„μ„ 금고둜 데렀가
03:33
and you claim your inheritance.
64
213209
1836
μ—¬λŸ¬λΆ„μ΄ μœ μ‚°μ„ 상속함을 μ„ μ–Έν•©λ‹ˆλ‹€.
03:35
Too bad your relatives were always too busy being nasty to each other
65
215045
3482
μΉœμ²™λ“€λ„ μ°Έ μ•ˆλμ–΄μš”, μ„œλ‘œ ν‰λ³΄λŠλΌ λ°”λΉ μ„œ
03:38
to pay attention to your eccentric uncle's riddles.
66
218527
2817
괴짜 μ‚Όμ΄Œμ˜ μˆ˜μˆ˜κ»˜λΌμ—λŠ” 관심도 μ—†μ—ˆλ‹€λ‹ˆμš”.
이 μ›Ήμ‚¬μ΄νŠΈ 정보

이 μ‚¬μ΄νŠΈλŠ” μ˜μ–΄ ν•™μŠ΅μ— μœ μš©ν•œ YouTube λ™μ˜μƒμ„ μ†Œκ°œν•©λ‹ˆλ‹€. μ „ 세계 졜고의 μ„ μƒλ‹˜λ“€μ΄ κ°€λ₯΄μΉ˜λŠ” μ˜μ–΄ μˆ˜μ—…μ„ 보게 될 κ²ƒμž…λ‹ˆλ‹€. 각 λ™μ˜μƒ νŽ˜μ΄μ§€μ— ν‘œμ‹œλ˜λŠ” μ˜μ–΄ μžλ§‰μ„ 더블 ν΄λ¦­ν•˜λ©΄ κ·Έκ³³μ—μ„œ λ™μ˜μƒμ΄ μž¬μƒλ©λ‹ˆλ‹€. λΉ„λ””μ˜€ μž¬μƒμ— 맞좰 μžλ§‰μ΄ μŠ€ν¬λ‘€λ©λ‹ˆλ‹€. μ˜κ²¬μ΄λ‚˜ μš”μ²­μ΄ μžˆλŠ” 경우 이 문의 양식을 μ‚¬μš©ν•˜μ—¬ λ¬Έμ˜ν•˜μ‹­μ‹œμ˜€.

https://forms.gle/WvT1wiN1qDtmnspy7