To offer a different perspective a bit: For every person who desires to learn for it, there are also folks who want to do as little as possible and see no issue with just copying solutions to turn into homework. This includes groups who hold onto the solutions and will give them out to folks taking the classes. Professors had one of two ways to fix that: change questions every year, or just not allow solutions.
That being said, I seem to recall that when I took math classes in college, we had books that had even questions that the solutions were in the back, and the odd questions did not (they were only provided to the teachers). The questions were largely the same, so if a student had an issue with an odd question, they were able to just go to the cooresponding even question and work it out. I felt that was a reasonable compromise.
That being said, I seem to recall that when I took math classes in college, we had books that had even questions that the solutions were in the back, and the odd questions did not (they were only provided to the teachers). The questions were largely the same, so if a student had an issue with an odd question, they were able to just go to the cooresponding even question and work it out. I felt that was a reasonable compromise.