Find A �� B, given A = {people who are less than 20 years old} and B = {people who have a job}.
A) {people who are less than 20 years old and people who have a job}
B) {people who are less than 20 years old and have a job}
C) {people who are less than 20 years old or people who have a job}
D) {all people in the world}
To find A ∩ B (the intersection of A and B), you need to identify the common elements between A and B, or in other words, find the set of people who belong to both A and B.
In this case:
A = {people who are less than 20 years old}
B = {people who have a job}
So, to find A ∩ B, you need to consider the set of people who are both less than 20 years old and have a job.
Therefore, the correct answer is A) {people who are less than 20 years old and people who have a job}.