If it’s word for word identical then Google is either caching the response locally for you, or caching it more broadly for all users for a certain period. They do this with regular search results as well, to save on having to process fresh results every time.
However as far as I can see from testing it myself, it generates a different LLM result every time, so I guess it’s just spinning a roulette wheel to see if you get a remotely accurate answer or not each time you search.
That's the ultimate question, isn't it? What are the chances of a correct answer? I've gotten plenty of correct ones -- more than half, I'd say. But also some whoppers. It once told me TREE(2) would be an immense number.
Not word-for-word. Just the same gist.