Chapter 2 - Set Theory - 2.4 Set Operations and Venn Diagrams with Three Sets - Exercise Set 2.4 - Page 92: 39

(A∩B)= {4,5,6}

The set (A∩B), represents the all the common elements of the universal set A and B. From the given Venn diagram we can conclude that the regions II & IV are common to both the sets A & B. The element of these regions are 4,5,6 So, (A∩B)= {4,5,6}