Дано множества : А= { х I х ∈ N, х ≤ 13 } ,
B= { х I х ∈ N , 10-х = 15 } , C= { хIх N,∠ 15 } . 1) A ∪ B -? , 2) A ∩ B -?, 3) A ∪ C - ?, 4) A ∩ C - ? .
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