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A surprise exam (Posted on 2002-04-26) Difficulty: 3 of 5
A professor tells his class that he will give them a surprise examination sometime next week.

For our purposes, an examination is considered a "surprise" if on that day, the class is not 100% sure that they will get an examination. (If they only suspect it, the examination can still be a surprise.)

Having given the class this warning, is it still possible for the professor to give them a surprise examination next week? (Assume that he will not give them an exam if it will not be a surprise.)

See The Solution Submitted by levik    
Rating: 3.3684 (19 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Liar liar! | Comment 9 of 39 |
It's not really a paradox... The students know the teacher is lying about it being a complete surprise, so they can just assume there will be a test some time next week.
  Posted by Gamer on 2003-04-11 13:32:52
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