Question

If A is the set of all residents of the United states, B the set of all Canadian citizens, and C the set of all women in the world, describe the sets

A intersection B intersection B intersection C

A-B

A-C

C-A

Answer 1

A intersection B: only residents of both the United States and Canada (if the dual citizenship is possible, or the empty set otherwise)

B intersection C: only women who are citizens of Canada.

A intersection B intersection B intersection C: only women who are residents of both the United States and Canada (if the dual citizenship is possible, or the empty set otherwise)

A-B: all residents of the United states who are NOT citizens of Canada

A-C: all residents of the United states who are NOT women

C-A: all women in the world who are NOT residents of the United States