If A and B are two non-empty sets then A ∪ B = _____?

{x|x ∈ A or x ∈ B}

{x|x ∈ A and x ∈ B}

{x ∈ A or x ∈ B}

None of these

The union of two sets A and B includes all elements that are in A, B, or both.

This is represented as: A ∪ B = {x | x ∈ A or x ∈ B}.