Here is something I just mentioned in a comment on my previous post on in-class voting. I often include two extra options at the end:
- E: Please explain the question again
- F: I’m not sure
Here option E usually gets very few votes, but it is quite revealing if the majority suddenly vote for E. This happened once in my first-year pure maths module this year, when I asked a counting question (how many different 3-cycles are there of a set with 8 elements?). Clearly my first attempt to explain the question failed! See timestamp 26:25 of the 18th lecture in Foundations of Pure Mathematics
and see if you can tell what went wrong!