tl;dr: an engineering prof made an unsolvable problem and had a TA ask the same problem online, and answer it with a wrong answer. Those who answered with the o

tl;dr: an engineering prof made an unsolvable problem and had a TA ask the same problem online, and answer it with a wrong answer. Those who answered with the online answer (because they went to the bathroom and found it on their phone) got a zero on the test. There are so many details lacking (e.g. when and where did this happen?) that I question its veracity, but if it did happen it seems pretty inconsiderate to the non-cheating students to put an unsolvable question on there.