Chapter 2 - Set Theory - 2.4 Set Operations and Venn Diagrams with Three Sets - Exercise Set 2.4 - Page 92: 40

(A∩C)= {6,7,8}

The set (A∩C), represents the all the common elements of the universal set A and C. From the given Venn diagram we can conclude that the regions IV & V are common to both the sets A & C. The element of these regions are 6,7,8 So, (A∩C)= {6,7,8}