Chapter 2 - Set Theory - 2.3 Venn Diagrams and Set Operations - Exercise Set 2.3 - Page 81: 18

B∩C = {2,3}

U = {1,2,3,4,5,6,7} A = { 1,3,5,7} B = {1,2,3} C = {2,3,4,5,6} B∩C shows the elements which are common in both the sets B and C. The elements which are common in both the sets are 2,3. Therefore B∩C = {2,3}