1. The problem statement, all variables and given/known data Let F be a finite field. Show that the product of all non-zero elements of F is -1. 2. Relevant equations An example of this is Wilson's Theorem. 3. The attempt at a solution Let G be the multiplicative group of non-zero elements of F. Then G is cyclic. Let a be the generator of G. Here I get stuck. I thought that by just taking the product of each element represented by some power of the generator would be enough, but hey, it isn't. Not sure what to do now. Thnx for any help.