In the course of finishing the exam, I searched on Google using terms relevant to the question I was struggling with. One of the first links that came up was an answer key to homework questions given in another class at another university in another part of the country. Several of the questions on the answer key were verbatim duplicates of questions on my exam with only minor variations in the initial set-up of the problem that would not affect the solution.
The answer key had only the questions and answers — no detail on how the answer was derived. I worked through the questions on the ‘other’ homework in order to understand how to solve the exam question and then applied that learning to answer the exam question.
I believe that I did my own work to the extent that I used the answer key provided by someone else to guide my understanding of the exam question — rather than simply copying the answer from one location to another, even though the answers are the same in both situations
Do I have an obligation to tell my professor what I found? To let him know that answers to specific exam questions are available for anyone to see?