Obvious cheating. All the right answers were the same. Proof enough.
What do they expect with take home exams?
Exams are not all multiple choice. In many cases the take home exams require a lot more research and originality as well as analytical thought than can be accomplished in a 1-2 hour final exam period. I had take home finals for a couple of graduate courses and they were without a doubt more strenuous than an exam designed for a 2-hour period. It is a lot easier to catch cheating on a test of that type and in particular if it is required to be submitted in electronic format. There are file comparison programs and services such as Turnitin.com that make it easier to find cheats and plagiarizers. I have had a large number of foreign students and most of them know (because I pound it into their psyches) what the rules are. Some of them still choose to cheat even when I tell them that I will certainly catch the deed. I failed 3 students this last term for submitting a programming final with exactly the same code with the same mistake for each of them. I even gave them a 5th warning just before they began the final and it didn’t click I guess.
“All the right answers were the same...”
Hmmm, and why shouldn’t right answers be similar?