Is it possible to be penalized (e.g., be banned from asking future questions or have points deducted) after having a certain number of your questions closed as duplicates?
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Not directly, but if you keep getting questions closed, you might get hit with a question ban.
Its relatively trivial to avoid getting complete duplicates - the site often prompts you, and where your question is substantially different, it helps to quote the other question when asking.
If you keep asking duplicate questions, you might want to re-look how you search the site, and try to adjust yourself, rather than wondering whether you'd get penalised