In a group of 50 students, 33 play tennis, 21 play badminton and 5 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: 4: the students who play neither are ignored. 12: that is the number who play only badminton.
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