>>589
>programmers (such as myself) may get filtered
Fellow programmer with relatively weak maths skills here. (Although I'm working on it, because I want to learn about electromagnetism.)

Maybe it's changed since you posted this, but currently I think it's good as-is. My degree was remarkably light on maths but I still covered enough logic/graph theory stuff to answer most of the captchas I've seen. To be honest, programmers who can't answer any of the current question bank probably haven't studied enough theory to make good contributions or ask good questions.

Also it really helps that the questions are multiple-choice, because it removes the need to fully/properly solve the problem. You just need to get close enough to either rule out the wrong answers or do a brute force check.
e.g. for a question about subgraphs, I worked out the answer for a small value of n by hand/intuition and then plotted the functions given. Only one matched up. Easy peasy.
For another question about cartesian products, I just wrote a tiny bit of javascript.

tldr, it's fine, keep it.