Posted by **Megan** on Monday, March 2, 2009 at 11:41am.

One particularly nice afternoon, several students were trapped in a classroom listening to a monotonous lecture by a professor the local college. After over two hours of mind-numbing discourse, one student stood up in despair and noted that she had a book with every word of the lecture in it and that others in the class also had the same book, so the professor should end the oration immediately. The professor was taken aback and asked her to prove it and she would stop at once. The student produced the proof. How?

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