[질문] 집합A={1,2,3,6,9,18}B={1,2,3,4,6,12}때A∩B진부분집합중에서3을원소로갖는집합은?

A∩B={1,2,3,6}의부분집합은{1}{2}{3}{6}{12}{13}{16}{23}{26}{36}{123}{136}{236}{126}{공집합}총 15개지요?이중 3을 포함한 집합은{3}{13}{23}{123}{136}{236}