Makoo Tuutotaa
A fi B’n tuutota yoo ta’an tuutni miseensota A yookiin B yookiin miseensota A fi B keessa jiranii tuuta A makoo B jedhama. Mallattoo A B, “A makoo B’’ jedhama.

Fakkeenya:

 {1, 2} ∪ {Diimaa, Adii} ={1, 2, Diimaa, Adii}
 {1, 2} ∪ {1, 2} = {1, 2}
 C {1, 3, 5, 7} fi D {2, 4, 6, 8} yoo ta’an, C D {1, 2, 3, 4, 5, 6, 7, 8}

Dhudhaalee Makoo Tuutaa

 A ∪ B = B ∪ A.
 A ∪ (B ∪ C) = (A ∪ B) ∪ C.
 A ⊆ (A ∪ B).
 A ∪ A = A.
 A ∪ ∅ = A.
 A ⊆ B yoo A ∪ B = B ta’e qofa.

Herreega