1) The symbols , , , , and represent set membership, subset, null set, union, intersection, and not (complement) respectively. 2) C represents the set of all prime numbers between 10 and 20. n(C) represents the number of elements in set C. 3) A Venn diagram is constructed to represent sets U, A, B, and C where elements are filled in each region and used to find quantities such as n(A), n(B), n(C), n(B and C'), n(A and B and C), and n