So, I'm a math major and when I'm take difficult classes I like to do extra problems in the textbook as a way to study. To help with this, I sometimes get text's solution manual. However, sometimes the problem sets include problems that are also in the textbook, and...I think you know where this is headed. Anyway, what are the ethics surrounding this? Personally, if I see the solution (whether it be on accident or deliberate), I find there are definitely places where I should "fill in the blank," which is what I do when writing up the solution myself. Typically, I will read through it, think about it, put the solutions away, and then attempt the problem again, which usually helps. I came to see it this way when one of my professors suggested it in class, and it seems fine to me. What do you think?