TEST 1. A. Define or describe by example the following in 1 or 2 sentences., 1. Set , 2. Elements , 3. Union of two sets , 4. Intersection of 2 sets , 5. Complement of a sets , 6. Universal set , 7. Cardinality of a set , 8. Venn diagram , 9. Subset , 10. Empty set tucing Yenn diagram.