1. Let U = {q, r, s, t, u, v, w, x, y, z}; A = {q, s, u, w, y}; B = {q, s, y, z}; and C = {v, w, x, y, z}. List the members of the indicated set, using set braces.

(A ? B)'

2. Let U = {q, r, s, t, u, v, w, x, y, z}; A = {q, s, u, w, y}; B = {q, s, y, z}; and C = {v, w, x, y, z}. List the members of the indicated set, using set braces.

(A ? C)

3. Let U = {q, r, s, t, u, v, w, x, y, z}; A = {q, s, u, w, y}; B = {q, s, y, z}; and C = {v, w, x, y, z}. List the members of the indicated set, using set braces.

B' ? (A ? C')

4. If n(A) = 4, n(B) = 9, and n(A ? B) = 2; what is n(A ? B)?

5. How many elements in the set {c,r,e,a,t,e}?

5. If Z represents the set of integers, then { y: -1 < y < 4 } is