Let U = {7, 8, 9, 10, 11, 12, 13}, A = {7, 8, 9, 10}, B = {7, 8, 11, 12}, and C = {9, 11, 13}. List all the members of the given set.

A ∪ (B ∩ C)

well, just work it step by step

B∩C = {11}
so,
A ∪ (B ∩ C) = {7, 8, 9, 10}∪{11} = ?