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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 everyone wants 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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Discrete Mathematics and Its Applications ( 8th International Edition ) ISBN:9781260091991
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