Let U = {1, 2, 3, 4, 5, 6, 7}, A = {1, 2, 3, 4}, B = {1, 2, 5, 6}, and C = {3, 5, 7}. List all the members of the given set.

No sets given!

Looks like you need to
(a) review intersections, unions and complements
(b) learn how to proofread your posts