Bob stumped God and the Devil

[Susam Pal]

Bob died, and met God and the Devil in his afterlife. He knew that
God always spoke the truth and the Devil always lied. He did not
know which one was which. He was allowed to ask one yes-no question
which both would answer. If he succeeded in deducing the identities
of the two entities, he would be sent to heaven. Otherwise, he would
be sent to hell.

Bob had other plans. He wanted to have some fun. He asked a question
that stumped God and the Devil. They could not answer it even though
they knew the facts required to answer the question.

Impressed with his logical prowess, they decided that Bob would work
with them [1] for the rest of his afterlife. What question might he
have asked to stump God and the Devil?

[1] God, the Devil and Bob: http://cotpi.com/p/10/

--
Originally posted at: http://cotpi.com/p/27/
Correct solutions will be archived at the cotpi link mentioned above.

Solutions to 'Basket of colourful balls':
http://cotpi.com/p/26/#responses

[Kunal Kishor]

I saw this puzzle last week :

"There are two locked boxes. Each contains the only key to unlock the other one. Alice unlocked both the boxes. How did she do it?"

What happened to it?

--
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[Susam Pal]

On Nov 15, 11:20 am, Kunal Kishor <talktoku...@gmail.com> wrote:
> I saw this puzzle last week :
>
> "There are two locked boxes. Each contains the only key to unlock the other
> one. Alice unlocked both the boxes. How did she do it?"
>
> What happened to it?

I've replaced that puzzle with a new one: http://cotpi.com/p/29/

The 'Two locked boxes' puzzles were not going well with the other
puzzles
in the website. The website contains mathematical and logical puzzles
and
I've decided to keep it that way henceforth.

[Susam Pal]

Just in case anyone is interested to know the answer, here is a
ROT13 hint:

Nyvpr vf vafvqr bar bs gur obkrf.

Now, that in my opinion is a lateral-thinking puzzle.