Chapter 2 - Set Theory - Chapter Summary, Review, and Test - Review Exercises - Page 109: 40

AUB = {1,4,5,6,8,9}

The set AUB represents the all the elements of set A and set B. From, the given Venn diagram regions I, II, III represents the set AUB. The elements of regions I, II, III are 1,4,5,6,8,9. So, AUB = {1,4,5,6,8,9}