Question: When three professors are seated in a restaurant, the hostess asks them: Does everyone want coffee? The first professor says: I do not know. The

When three professors are seated in a restaurant, the hostess asks them: "Does everyone want coffee?" The first professor says: "I do not know." The second professor then says: "I do not know." Finally, the third professor says: "No, not everyonewants coffee." The hostess comes back and gives coffee to the professors who want it. How did she figure out who wanted coffee?

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