Which Door Leads to Heaven?

[jdsouza]

There are two doors and seated before each, is one spirit being.

One is the devil, who is a compulsive liar. The other is an angel, who always tells the truth, regardless. Both converse with only a "Yes" or a "No".

There is no way to tell which of the two is the devil / angel.

One of the doors leads to heaven, the other to hell. And you need to know which door leads to heaven.

You are allowed to ask any ONE of the spirit beings only ONE question.

What would your question be and based on the response know which door leads to heaven?

 

[madforgolf]

Ask which door leads to heaven.
The devil will point to hell, the angel will think of the answer that the devil will say and also point to hell leaving you to take the other door.

 

[jdsouza]

Ask the question for which you expect only a Yes or No as an answer.

You're so 'somewhat' right. Perhaps, memory needs to be jogged a bit more ..

 

[shg]

"If I were to ask you if the door on the right leads to heaven, would you say yes?"

 

[jdsouza]

Nearly there.

 

[shg]

If it were true, the angel would say yes, and the devil would say yes (if asked if it were the door, he'd say no; asked if he were asked, he'd say yes).

 

[jdsouza]

Your question could have stopped at "Is this the door that leads to heaven?" Then the opposite of the Yes or No answer would be unambiguous.

 

[shg]

What am I missing? The angel and devil would always give opposite answers to, "Is this the door that leads to heaven?"

 

[jdsouza]

[TABLE="class: grid, width: 500"]
<tbody>[TR]
[TD]Door A[/TD]
[TD]Door B[/TD]
[TD][/TD]
[TD]Door A[/TD]
[TD]Door b[/TD]
[/TR]
[TR]
[TD]Devil[/TD]
[TD]Angel[/TD]
[TD][/TD]
[TD]Angel[/TD]
[TD]Devil[/TD]
[/TR]
[TR]
[TD]What would the being in front of Door 'B' say if I asked him, is Door 'A' the door that leads to heaven?[/TD]
[TD]What would the being in front of Door 'A' say if I asked him, is Door 'A' the door that leads to heaven?[/TD]
[TD][/TD]
[TD]What would the being in front of Door 'B' say if I asked him, is Door 'A' the door that leads to heaven?[/TD]
[TD]What would the being in front of Door 'A' say if I asked him, is Door 'A' the door that leads to heaven?[/TD]
[/TR]
</tbody>[/TABLE]

The correct answer is ..

The angel and the devil would give the same answer but the opposite is true.
What would the other entity (spirit being) say if I asked him, it this is the door that leads to heaven?

If the answer obtained is "Yes", Actually Door 'B' leads to heaven. If the answer is 'No' then Door 'A' leads to heaven.

 

[shg]

I think mine is equally valid.