Need help with Q6

For Problems 5 and 6, we define a new set operator called NINTERSECTION, denoted by the symbol n . For any two sets, x e A n B if and only if it is not the case that x e A and x e B. That is, A , B = {x|XE A B }. 5. If A is a set, what is the set An A ? Prove your claim. 6. If A and B are sets, what is the set (An in B) ? Prove your claim