Number of students who opted for econometrics course or game theory course is equal to 45. It is found that 25 students have taken both the courses and 30 students are doing game theory. How many students are doing econometrics?
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Combinatorics and counting has come up 24 times in 5 exams since 2009.
This question is on Inclusion-exclusion and complementary counting, part of Combinatorics and counting in Mathematics.
Counting by adding and removing overlaps, or by counting what is not wanted.
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Question from the UoH 2013 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.