Chapter 2 - Set Theory - 2.4 Set Operations and Venn Diagrams with Three Sets - Exercise Set 2.4 - Page 92: 35

AUB= {1,2,3,4,5,6,7,8,9,10,11}

The set (AUB), represents the all the elements of the set A and the elements of B which are not present in set A. From the given Venn diagram we can conclude that the regions I, II, III, IV, V, VI represent the set (AUB). The element of these regions are 1,2,3,4,5,6,7,8,9,10,11 So, AUB= {1,2,3,4,5,6,7,8,9,10,11}