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แบบทดสอบ
1. กำหนด A = {1, 2, 3, 4, 5} และ B = {3, 4, 6, 7, 8} จงหา n(A B)
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2. กำหนด A = {1, 2, 3, 4} และ B = {5, 6 ,7} จงหา n(A B)
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3. กำหนด A = {1, 2, 3, 4, 5}, B = {3, 5, 6, 7} และ C = {3, 6, 4, 8} จงหา n(A B C)
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