Question

There are 300 students in a twelfth grade high school class. 120 of these students have at least one sister and 100 have at least one brother. Out of the students that have at least one brother, there are 40 who have at least one sister and one brother.

Answer 1

Answer:

120 of these students have at least one teacher and 100 have at least one. ... Out of the students that have at least one brother, there are 40 who have at least ... Let A be the event that randomly selected a student in the class has a sister and B ...