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Watson will pull it out in Final Jeopardy: name the first billion digits of pi.

I wouldn't be surprised if Watson couldn't come up with the correct question (answer).

It seems semantic, not computation-based like wolframalpha.

By the way here is Wolfram on Watson (from January):

There's no way they would ask that question.

You're right. They would state the answer, and the contestant would ask the question. My bad.