So I am asking this due to this post https://math.stackexchange.com/questions/1616911/cycles-of-length-six-in-a-complete-bipartite-graph
This isn't the only post I have seen this in, where someone asks a question that to me seems perfectly suited for mathSE but it becomes closed as off topic. What I am wondering is 1. Why was this post put off topic, or what am I not understand about the MathSE guidelines? And 2. Is there a reason why explanations aren't given when a question is put on hold like this?