Mathematics for IGCSE & O level - Sets (Section 2 - No. 46)

If A = {a, b, c} and B = {c, d, e}, what is (A ∪ B)' if the universal set is {a, b, c, d, e, f}?

{a, b, c, d, e}

{f}

{a, b, c, d, e, f}

{}

A ∪ B = {a, b, c, d, e}. (A ∪ B)' includes the elements in the universal set but not in A ∪ B, which is {f}.