In one particular university class, many people stopped attending after about half the semester was over as the professor was "confusing" as many people phrased it and opted to instead study from the textbook. The course syllabus outlines the chapters in the textbook that would be subject to testing. The class does not have an attendance policy. It is not recorded, though powerpoints are posted, and you would not get a rundown of what occurred in class in case of absence since the textbook and powerpoints are available.
Near the end of the course, a new topic not found in the lecture slides or textbook was brought up for approximately 10 minutes(each lecture is 1.5hours). I was not in attendance that day. The topic was not mentioned in the syllabus, no online announcement was made that an extra topic was added.
This topic was then put on the final exam as a question of its own. Later, on group pages, students who attended class mentioned that the topic was not explained well at the time, but the professor did say "at least you'll have an advantage on the final over the absent students". Many people sent e-mails to the prof and none have heard back yet.
Is there any recourse now in terms of marks or having the question removed in your opinion? Furthermore, could you provide on brief response as to whether you think the prof was justified in doing this?