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Questions such as the Monty Hall problem that ask for a probability as an answer. The reason the question is difficult is usually because a lack of information makes a unique correct answer impossible. Textbooks usually present a supposedly correct answer anyway, relying on educational intelligence to provide the missing information.

A trivial example: how likely is it to rain tomorrow? Answer: 50%, either it rains or it doesn't.

Pascal's wager basically relies on the same argument.

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