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If U = {a, b, c, d, e, f}, A = {a, b, c}, B = {c, d, e, f}, and C = {c, d, e} find (A ∪ B) ∪ C.

Correct Answer: U

Explanation:

A ∪ B = { a, b, c } ∪ { c, d, e, f } = { a, b, c, d, e, f }
∴ (A ∪ B) ∪ C = { a, b, c, d, e, f } ∪ { c, d, e }
= { a, b, c, d, e, f }
= U.


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