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This brain teaser is a bit of a classic, and I'm sure

a bunch of you have heard it before.

But I wanted to include this in the brain teaser playlist

that I'm making right now.

Because this one is actually a good build up, and a bit of a

nice warm up session for a slightly harder brain teaser

that deals with people telling the truth and lying.

So this one, we could call it the truth teller and the liar.

So we're on some type of adventure quest, and we get to

a fork in a road, right?

So let's say that there's two doors.

That's even better.

So there's two doors.

And I've gotten to the end of my adventure quest. And I know

that my treasure is behind one of these two doors.

Unfortunately, behind the other door is slow and painful

death, and all of the misery in the world.

So I want to pick the door carefully.

And beside these doors, there are two people sitting there.

There's one guy that looks like this.

And then there's another guy that looks like this.

And I know for a fact - the gods of brain teasers have

come and told me - that both of these guys know which door

has the treasure, and both of these guys know which door has

the unbelievable despair that would ensue if

I opened that door.

So both of these guys know which

door I should be opening.

And I also know, and both of them know, that one of them

always tells the truth.

One is always honest. And then one of them always lies.

And the problem is I don't know who's who.

And I only have one chance.

Obviously I can't just open a door and close it.

If I open the wrong door, the despair

will come out and kill.

And you know, all of the pain will happen.

And I can only ask one question of one of them to

decide which door to open.

So remember, they both know the correct answer.

But one of them always lies.

One of them always tells the truth.

And I only have one question to ask of one of them.

So the brain teaser is: What question do you ask?

Who do you ask it to?

Do you ask it to the green guy or to the brown guy?

And then what do you do based on what they tell you?

So that is the problem description.

And I will now give you the solution.

So if you don't want the solution, and I

encourage you not to.

I think if you think about this one for maybe 20 or 30

minutes, or at most a day.

Sometimes when you sleep on a brain teaser it

might come to you.

So I encourage you to do that.

So pause it, stop it, whatever.

Don't listen anymore.

Because here is the solution.

So what you do is — I mean, you don't know who's who.

So it's not like there's a correct answer on who you ask

a question of.

But what you do is you ask you either of the people, what

would the other guy say is the correct door to open?

So let's think about this.

So I could ask this guy, I'm asking the green guy, what

would this guy say is the correct door to open?

Now what happens if this guy tells the truth?

If this guy tells the truth, then this

guy's the liar, right?

And so he will actually tell me what this guy

would tell me to do.

So what would the other guy say is the correct door

to open, right?

So this guy, if you were to tell him the correct door

to open, he would tell you the incorrect door to open.

Right?

So when you ask this guy what would that guy say, he'll be

honest about what this guy would say.

And since he's a liar, he would tell you

the incorrect door.

So the answer to this question, you would get the

incorrect door.

a bunch of you have heard it before.

But I wanted to include this in the brain teaser playlist

that I'm making right now.

Because this one is actually a good build up, and a bit of a

nice warm up session for a slightly harder brain teaser

that deals with people telling the truth and lying.

So this one, we could call it the truth teller and the liar.

So we're on some type of adventure quest, and we get to

a fork in a road, right?

So let's say that there's two doors.

That's even better.

So there's two doors.

And I've gotten to the end of my adventure quest. And I know

that my treasure is behind one of these two doors.

Unfortunately, behind the other door is slow and painful

death, and all of the misery in the world.

So I want to pick the door carefully.

And beside these doors, there are two people sitting there.

There's one guy that looks like this.

And then there's another guy that looks like this.

And I know for a fact - the gods of brain teasers have

come and told me - that both of these guys know which door

has the treasure, and both of these guys know which door has

the unbelievable despair that would ensue if

I opened that door.

So both of these guys know which

door I should be opening.

And I also know, and both of them know, that one of them

always tells the truth.

One is always honest. And then one of them always lies.

And the problem is I don't know who's who.

And I only have one chance.

Obviously I can't just open a door and close it.

If I open the wrong door, the despair

will come out and kill.

And you know, all of the pain will happen.

And I can only ask one question of one of them to

decide which door to open.

So remember, they both know the correct answer.

But one of them always lies.

One of them always tells the truth.

And I only have one question to ask of one of them.

So the brain teaser is: What question do you ask?

Who do you ask it to?

Do you ask it to the green guy or to the brown guy?

And then what do you do based on what they tell you?

So that is the problem description.

And I will now give you the solution.

So if you don't want the solution, and I

encourage you not to.

I think if you think about this one for maybe 20 or 30

minutes, or at most a day.

Sometimes when you sleep on a brain teaser it

might come to you.

So I encourage you to do that.

So pause it, stop it, whatever.

Don't listen anymore.

Because here is the solution.

So what you do is — I mean, you don't know who's who.

So it's not like there's a correct answer on who you ask

a question of.

But what you do is you ask you either of the people, what

would the other guy say is the correct door to open?

So let's think about this.

So I could ask this guy, I'm asking the green guy, what

would this guy say is the correct door to open?

Now what happens if this guy tells the truth?

If this guy tells the truth, then this

guy's the liar, right?

And so he will actually tell me what this guy

would tell me to do.

So what would the other guy say is the correct door

to open, right?

So this guy, if you were to tell him the correct door

to open, he would tell you the incorrect door to open.

Right?

So when you ask this guy what would that guy say, he'll be

honest about what this guy would say.

And since he's a liar, he would tell you

the incorrect door.

So the answer to this question, you would get the

incorrect door.

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