1. The problem statement, all variables and given/known data Good day all, Im completely stumped on how to show this: |AN|=(|A||N|/A intersect N|) Here: A and N are subgroups in G and N is a normal subgroup. I denote the order on N by |N| 2. Relevant equations Second Isomorphism Theorem 3. The attempt at a solution Well, I know know im supposed to use the theorem, but I have no idea where to start! I dont seem how to relate what the theorem says to orders of sets.... Any help would be greatly appreciated!