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}.