tolong buatkan contoh himpunan A n B A u B A - B

A={1,2,3,4,5,6,7}
B={2,3,4,6,7,8,9}
A n B={2,3,4,6,7}
A u B={1,2,3,4,5,6,7,8,9}
A-B={1,5}