Mathematics, 21.10.2020 16:01, uuytay

There are 300 students on a twelfth grade high school class. 120 of these students have at least one teacher 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 . Let A be the event that randomly selected a student in the class has a sister and B be the event that the student has a brother

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