Mēnā ka whakakotahi mai ngā huānga o ētahi huinga e rua, ka kīia tērā ko te huinga tūhono. Ko te ∪ hei tohu i te huinga tūhono. Hei tauira: A = {1, 2, 3, 4, 5} E = {3, 4, 5, 6, 7} A ∪ E = {1, 2, 3, 4, 5, 6, 7} (TRP 2010:128). / If the elements of two sets are combined that is called a union of sets. For example: A = {1, 2, 3, 4, 5} E = {3, 4, 5, 6, 7} A ∪ E = {1, 2, 3, 4, 5, 6, 7}.

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