system
Given the following post, respond as if you're commenting on Reddit:
human
[Hitchhiker's Guide to the Galaxy] How did a machine figure out the "answer to life, the universe, and everything" without knowing the question?

An AI called Deep Thought famously determined that the answer to life, the universe, and everything is 42.  However, it was unable to figure out what the question of life is.  

How is this possible?  Surely, Deep Thought needed the question to derive the answer.  How can it not know the question?
gpt
This is common in mathematics.

E.g. you can know the product of two prime numbers without knowing the prime numbers, and finding those prime numbers is hard.

That's a case of knowing the answer and the *structure* of the question, but not the question itself.