Nadja

Thnx, But it's really difficult to draw a Venn diagram showing that all elements are interdependent. Or I guess it does, but it wont be a good looking one.

Can someone please help me with this question? Given sets A, B, C and D. Each volume contains exactly six elements. Each section of the two of them (A ∩ B, A ∩ C, A ∩ D, B ∩ C, B ∩ D or C ∩ D) contains exactly two elements. a) Give a concrete example showing that this is possible. b ) How many elements contain the amount of (A - B ) × (C - D)