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