Sets 3
1 mark · EasyA group of 40 students is surveyed. 18 students play tennis (set T), and 6 students play both tennis (T) and basketball (B). What is the number of students who play both tennis and basketball, n(T ∩ B)?
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6 (±0)
Common mistakes: Giving n(T) instead of n(T ∩ B)
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Marking points
A1 · 1 mark · Correctly identifies n(T ∩ B) = 6 from the information provided.
Worked solution
From the information, 6 students play both tennis and basketball, so n(T ∩ B) = 6.