I had a freshman-junior math teacher at a private school that would give questions like this but it'd be more to access how much you'd be able to understand things further than what you were taught. He'd however give bonus points if you got the right answer because a few of them were mostly incomprehensible for a young mind to answer accurately and just for bonus points as well. So most of the class would have a 70 (which was a D) or 90+(with a lot of wrong answers) Also the tests were "multiple guess" on a scantron and he improvised the answers as the test went along, often time to where the answers were in a pattern that could also give you a perfect score. So you had to either understand his ramblings, learn it on it your own or convey the ability to guess accurately enough. It was some mad scientist shit. Never learned more from a class than then.