Chapter 2 - Set Theory - 2.4 Set Operations and Venn Diagrams with Three Sets - Exercise Set 2.4 - Page 93: 72

(AUB)'

As per the given Venn Diagram, The shaded region represents the region which are not belongs to either A or B. We know, (AUB) represents the regions I, II, III. But, we require the region IV. So, if we complement the (AUB) we get the required region. Therefor the required region is (AUB)'.