If A and B are two non-empty sets, then A ∪ B = ----- :

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1 + 4 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

If A and B are two non-empty sets, then A ∪ B = ----- :

ϕ

A ∩ B

B ∩ A

B ∪ A