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- Il PULVÉRISE le meilleur brainteaser de Jokariz en 10 minutes ?!
Il PULVÉRISE le meilleur brainteaser de Jokariz en 10 minutes ?!
La rediffusion complète du live sera publiée jeudi à 12h sur cette chaîne.
Retrouvez-nous en stream tous les lundis à 19h sur ma chaîne Twitch :
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Video Transcript
I want to start with something a bit annoying from the start
it's a complicated question, Lucas, so don't worry if you don't know it
and we'll see how you think
you're with us Lucas, just don't look at the chat or anything
you're with us, 100% with us
there's a californian cowboy
sadistic, who captures 200 mexicans
The 200 Mexicans, he will put them hats of different colors, 5 colors of hats.
So a red, a yellow, a purple, a blue and a multicolor for example.
He says to the mexicans, it's gonna be very simple, I'm gonna shoot you 200 at the Indian line
And the mexican who is at the back sees all the guys in front of him
He's gonna shoot a gun on the mexican's tent one by one
Starting with the one at the back
He's only allowed to say one color, so one of five colors
If it's the right one, he survives
And we move on to the next guy, if it's the wrong one, he's shot
And we move on to the next guy
Mexicans, before they put their hats on their heads, can agree on a strategy to optimize the number of survivors.
What is the optimal strategy to implement?
They are only allowed to say one word, right?
They are only allowed to say one word, they are only allowed to say one color, one of five colors.
And if it's not the right one, which is the hat on their head, they are shot.
If it's the right one, they are alive.
And then we move on to the next one and so on.
I just remind you that the Mexican...
So the hats are randomly distributed
There can theoretically be 200 hats of the same color
potentially
They are randomly distributed among the 5 colors
And I just remind you that we start with the one at the back of the line
and who sees all the hat colors in front of him
If you have any questions, do not hesitate, it may not have been clear the way I said it
Why are we talking about Mexican?
I want to clarify that it's an enigma that was posed by Californians.
It was in those terms that it was given to me.
With the sombreros, the colors, we can imagine the thing.
First of all, the problem seems very complex.
The first reflex I'm going to have is to try to simplify it.
We can play on two things, it's the number of colors.
It would be much easier to start with only two colors at the beginning.
And see with much less Mexicans.
So you can see the trivial case where for example there are just two, they have black and white as colors.
So we have two possible situations, either both have black hats, two have white hats or vice versa.
When I try to see it like that, I would say that for me they can agree by saving the first one.
To save both of them seems complicated because the first one doesn't have all the information
but we could say that the one behind will give you the color of the hat he has in front of him
and it allows you to save your friend.
With this strategy, how many people do you save?
If you do this strategy on the 5 hat colors, on the 200, how many people do you save?
If everyone gives the hat of the guy in front of him.
