Forgive me if this has been asked and answered, but I did some searching and couldn't find it.
I've got a problem set with 4 questions in it. I'd like the fourth one to be extra credit, so that students could achieve a score of 4 out of 3 for the set.
I could weight that problem at 0 in the Homework Sets Editor, but then students don't properly get awarded credit for that problem if they answer it correctly -- if they get all four right, their score appears as 3 / 3 rather than 4 / 3.
Is there a good way to do this that I'm overlooking?