My K prof handed out a series of practice questions for his exam. One of the questions contained a possible error that did not render the question inanswerable but completely changed the rationale. He say's that it was an "obvious" error, and that I should have indicated as much in my answer.
Damn. While I think he's wrong, he's the prof, so as the kids say nowadays, "Whevs."
Have any of your professors indicated what you should do if you encounter an error, be it possible or obvious?