Укажи сочетательное свойство объединения множеств.

(A ∪ B) ∪ C = A ∪ (B ∪ K)

A ∪ (B ∪ C) = (A ∪ B) ∪ C

A ∪ (B ∪ C) = A ∪ (B ⋂ C)

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