My number theory has been lacking, so i decided to practice it a bit. I have gotten better in the sense that i can figure out where to begin approaching a problem, but i am having trouble seeing the goal and the starting place in this one.
I tried $\{2, 4, 8\}$ modulo $14$ and this is a group with identity $8.$
Please tell me where or how you would begin approaching this problem, as i still want to try and tackle it myself.
Thanks in advance.