Can you solve the locker riddle? - Lisa Winer

Znate li da rešite zagonetku sa sandučićima? - Liza Vajner

11,727,679 views

2016-03-28 ・ TED-Ed


New videos

Can you solve the locker riddle? - Lisa Winer

Znate li da rešite zagonetku sa sandučićima? - Liza Vajner

11,727,679 views ・ 2016-03-28

TED-Ed


Please double-click on the English subtitles below to play the video.

Prevodilac: Mile Živković Lektor: Milenka Okuka
00:06
Your rich, eccentric uncle just passed away,
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Vaš bogati, ekscentrični ujak je upravo preminuo
00:10
and you and your 99 nasty relatives have been invited to the reading of his will.
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i vi i vaših 99 gadnih rođaka pozvani ste na iščitavanje testamenta.
00:16
He wanted to leave all of his money to you,
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Hteo je da sav novac ostavi vama,
00:19
but he knew that if he did, your relatives would pester you forever.
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ali znao je da ako to uradi, rođaci će vas zauvek gnjaviti.
00:24
So he is banking on the fact
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Te se kladi na činjenicu
00:27
that he taught you everything you need to know about riddles.
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da vas je naučio sve što treba da znate o zagonetkama.
00:32
Your uncle left the following note in his will:
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Vaš ujak ostavio je ovu poruku u svom testamentu:
00:35
"I have created a puzzle.
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"Stvorio sam zagonetku.
00:37
If all 100 of you answer it together, you will share the money evenly.
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Ukoliko svih 100 vas odgovorite zajedno, podelićete novac na jednake delove.
00:42
However, if you are the first to find the pattern and solve the problem
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Ipak, ukoliko budete prvi koji reši šablon i reši problem,
00:46
without going through all of the leg work,
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bez svog tog silnog posla,
00:48
you will get the entire inheritance all to yourself.
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dobićete sami celo nasledstvo.
00:52
Good luck."
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Srećno."
00:54
The lawyer takes you and your 99 relatives to a secret room in the mansion
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Advokat vodi vas i vaših 99 rođaka u tajnu sobu u vili
00:58
that contains 100 lockers,
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koja ima 100 sandučeta,
01:01
each hiding a single word.
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i svaki sadrži jednu reč.
01:04
He explains:
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On objašnjava:
01:05
Every relative is assigned a number from 1 to 100.
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svaki rođak dobija broj od 1 do 100.
01:09
Heir 1 will open every locker.
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Naslednik 1 otvoriće svako sanduče.
01:12
Heir 2 will then close every second locker.
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Naslednik 2 će onda zatvoriti svaku drugo sanduče.
01:16
Heir 3 will change the status of every third locker,
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Naslednik 3 promeniće status svakog trećeg sandučeta,
01:20
specifically if it's open, she'll close it,
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tj. ako je otvoren, zatvoriće ga,
01:23
but if it's closed, she'll open it.
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ali ako je zatvoren, otvoriće ga.
01:26
This pattern will continue until all 100 of you have gone.
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Šablon će se nastiviti dok se ne izređa svih 100 vas.
01:31
The words in the lockers that remain open at the end
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Reči u sandučadima koji ostanu otvoreni na kraju
01:34
will help you crack the code for the safe.
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pomoći će vam da rešite šifru na sefu.
01:38
Before cousin Thaddeus can even start down the line,
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Pre nego rođak Tadeus može i da krene,
01:42
you step forward and tell the lawyer you know which lockers will remain open.
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vi istupite i kažete advokatu da znate koja sandučad će da ostanu otvorena.
01:49
But how?
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Ali kako?
01:51
Pause the video now if you want to figure it out for yourself!
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[Pauzirajte video sada, ukoliko želite da saznate sami!]
01:54
Answer in: 3
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[Odgovor za 3]
01:55
Answer in: 2
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[Odgovor za 2]
01:56
Answer in: 1
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[Odgovor za 1]
01:58
The key is realizing that the number of times a locker is touched
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Ključ je u tome da shvatite da je broj puta koliko će neko dodirnuti sanduče,
02:02
is the same as the number of factors in the locker number.
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isti kao broj faktora u broju sandučeta.
02:06
For example, in locker #6,
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Na primer, za sanduče broj 6,
02:09
Person 1 will open it,
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osoba 1 će ga otvoriti,
02:10
Person 2 will close it,
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osoba 2 će ga zatvoriti,
02:12
Person 3 will open it,
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osoba 3 će ga otvoriti
02:14
and Person 6 will close it.
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i osoba 6 će ga zatvoriti.
02:17
The numbers 1, 2, 3, and 6 are the factors of 6.
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Brojevi 1, 2, 3 i 6 faktori su broja 6.
02:22
So when a locker has an even number of factors
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Tako da kada sanduče ima paran broj faktora,
02:25
it will remain closed,
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ostaće zatvoren,
02:26
and when it has an odd number of factors,
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a kada ima neparan broj faktora,
02:28
it will remain open.
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ostaće otvoren.
02:30
Most of the lockers have an even number of factors,
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Većina sandučića ima paran broj faktora,
02:33
which makes sense because factors naturally pair up.
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što ima smisla jer faktori po prirodi idu u parovima.
02:37
In fact, the only lockers that have an odd number of factors
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Zapravo, jedini sandučići koji imaju neparan broj faktora
02:41
are perfect squares
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biće savršeni kvadrati
02:43
because those have one factor that when multiplied by itself equals the number.
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jer oni imaju faktor koji kada se pomnoži sam sa sobom daje jednak broj.
02:48
For Locker 9, 1 will open it,
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Za sanduče 9, 1 će ga otvoriti,
02:51
3 will close,
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3 će je zatvoriti
02:52
and 9 will open it.
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a 9 će je otvoriti.
02:54
3 x 3 = 9,
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3 x 3 = 9,
02:57
but the 3 can only be counted once.
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ali 3 se može računati samo jednom.
02:59
Therefore, every locker that is a perfect square will remain open.
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Stoga će svako sanduče koje je savršen kvadrat ostati otvoreno.
03:04
You know that these ten lockers are the solution,
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Znate da je rešenje u ovih deset sandučića,
03:07
so you open them immediately and read the words inside:
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pa ih otvarate odmah i čitate reči unutar njih:
03:11
"The code is the first five lockers touched only twice."
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"Šifra je prvih pet sandučića koja su dotaknuta samo dvaput."
03:17
You realize that the only lockers touched twice have to be prime numbers
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Shvatate da su jedini sandučići dotaknuta dvaput, ona s prostim brojevima,
03:21
since each only has two factors:
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pošto svaki ima samo dva faktora:
03:24
1 and itself.
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1 i sam taj broj.
03:26
So the code is 2-3-5-7-11.
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Šifra je onda 2-3-5-7-11.
03:30
The lawyer brings you to the safe,
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Advokat vas vodi do sefa
03:33
and you claim your inheritance.
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i preuzimate svoje nasledstvo.
03:35
Too bad your relatives were always too busy being nasty to each other
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Šteta što su vaši rođaci uvek bili zauzeti time da budu loši jedni prema drugima
03:38
to pay attention to your eccentric uncle's riddles.
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da bi obratili pažnju na zagonetke vašeg ekscentričnog ujaka.
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