An AI writes its answer one small piece at a time and picks each piece with some chance, a bit like a weighted die. So the same question can give different answers. That is normal, and nothing is wrong with your question.
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Rule of thumb
AI is not a calculator. Treat an answer as a weighted dice roll, and check the facts that matter.
Sources: official documentation from AI providers (listed in the video description). Steps 1 to 3 are our own general advice. Tools and settings change.