NECO Mathematics 2022 Objective — Question 3
Question 3 of 50 from the National Examinations Council (NECO) Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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Given that A and B are sets such that n(A)=8, n(B)=12 and n(A∩B)=3, find n(A∪B).
- A. 15
- B. 17Correct
- C. 20
- D. 23
Explanation
n(A∪B) = n(A)+n(B)-n(A∩B) = 8+12-3 = 17.
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