When three professors are seated in a restaurant, the...

Name: Problem 21, Chapter 1: Discrete Mathematics and its Applications
Uploaded: 2019-09-06T12:07:24-08:00
Duration: 1 min 7 s
Channel: Clarissa Noh
Description: 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?

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?

Key Concepts

Epistemic Reasoning

Epistemic reasoning involves analyzing what different agents know or do not know and deducing conclusions based on that information. In puzzles of this nature, each participant’s response provides insights into their private information as well as their beliefs about others’ knowledge, making reasoning about knowledge key to finding the solution.

Common Knowledge

Common knowledge refers to information that is publicly known by all participants, and everyone knows that everyone else is aware of it as well. This concept is crucial in multi-agent puzzles since each professor not only considers their own preference but also the awareness that others are adhering to the same rational decision-making process.

Sequential Inference

Sequential inference is the process by which agents update their understanding and deductions based on the order in which information is revealed. In this puzzle, the sequence of responses allows both the professors and the hostess to gradually eliminate uncertainty about who does and does not want coffee.

Process of Elimination

The process of elimination is a logical method used to remove impossible or less likely possibilities based on the information available. As the professors' answers progressively narrow down the viable scenarios, the hostess can deduce who among them wants coffee by ruling out the incompatible cases.

Transcript

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