Question: Consider a group of 120 students. They are split into two lectures (60 students each). They are also split into six labs (20 students each).

Consider a group of 120 students. They are split into two lectures (60 students each). They are also split into six labs (20 students each). All assignments of students to lectures and labs are equally likely. How many classmates does Barry expect to be in both his lecture and his lab too?

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