The foolproof way to eliminate fall-out

In the wikipedia article about information retrieval it says:

It is trivial to achieve fall-out of 0% by returning zero documents in response to any query.

If you are not into information retrieval and don’t want to read about it, here’s what the above says in layman’s terms: It is trivial to say nothing wrong by not responding to any question at all. What an insightful statement, isn’t it?

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