In a group of 80 students, 42 play tennis, 40 play badminton and 7 play neither. How many play both?
Answer and explanation
Correct answer: C. 9
- Step 1: Students who play at least one sport: .
- Step 2: By inclusion-exclusion , so both .
Answer
9.
Why not the others: 2: the students who play neither are ignored. 31: that is the number who play only badminton.
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