Set Theory and Logic


The Surprise Exam Paradox: Students Should be Surprised on Wednesday or Tuesday.

Authors: Tomonori Hirasa

The students in the surprise exam story reasoned that no surprise exam could take place on any day of the week. Actually, however, the students were surprised on Wednesday by the teacher's surprise exam. In this paper, we show where the students' reasoning went wrong and that students should be surprised on Wednesday or Tuesday.

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Submission history

[v1] 2019-04-06 14:00:21

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