1. The problem statement, all variables and given/known data Let S be a set of things and let P be the set of subsets of S. For A, B in P define A*B = ((S-A) intersect B) union (A intersect (S-B)). Need to show that (P,*) is commutative and the group identity. 2. Relevant equations 3. The attempt at a solution only attempted to show through venn diagrams..looking for an alternative approach?