Chapter 2 - Set Theory - 2.3 Venn Diagrams and Set Operations - Exercise Set 2.3 - Page 81: 37

A ∪ U = {1,2,3,4,5,6,7}

A ∪ U U = {1,2,3,4,5,6,7} A = {1,3,5,7} The set A ∪ U represents all the elements of set A and elements of set U that are not present in 'A' . The elements of U that are not in A are 2,4,6. The elements of A ∪ U are 1,2,3,4,5,6,7. Therefore set A ∪ U = {1,2,3,4,5,6,7}