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Intersection of Sets of Student Courses

by Charles Osariemen
(Benin City, Edo State, Nigeria)

In a class

- 50 students study biology
- 35 students study physics
- 30 students study economics

+ 25 students study both biology and physics
+ 12 students study both physics and economics
+ 10 students study biology and economics

How many students study each different subject ?

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