Answer:

9. B''

• b. B'' = {3, 7, 13, 15}

10. B n C

• c. {9, 11}

11. A - B

• d. {3, 7, 13, 15}

12. A u B

• c. {3, 5*, 7, 9, 11, 13, 15}

13. A n B

• d. {3, 5, 7, 11, 13, 15}

14. B - C

• ??

15. B u C

• a. {3, 5, 9, 11, 13, 15}