(A n B)' = A' u B' could be one way of looking at this problem. Basically you shade everything except A n B. So all of A except the part that intersects with B, all of B except the part that intersects with A, and everything outside of both A and B.
I want an equivalent statement shown using Venn diagrams. I am lost. I know I need a Venn diagram showing A and B minus the intersection plus all of the outside. A' intersect B' gives all of outside. So how do I get outside and A and B minus the intersection?