240번:①/④/③/{5, 10, 15}/②/{1, 2, 3, 4, 5, 8}/③/④/③/{2, 4, 6, 8} 250번:③/④/A교B={5, 8}A합B={3, 4, 5, 6, 7, 8, 9}/③/①/5/14/{2, 3, 5, 6}/⑤/⑤
당신은 어느 그룹입니까?