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.)

(In reply to Surprise by Half-Mad)

And since all the students logically figured out that there can't be any exam at all, the professor was able to surprise them by giving the exam on... oh let's say Tuesday.

Posted by Happy on 2002-06-28 12:47:11