Question 3
SetsGiven 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.17
- C.20
- D.23
Show the answer and explanation
Answer: B (17)
Explanation
n(A ∪ B) = n(A) + n(B) − n(A ∩ B) = 8 + 12 − 3 = 17.
Given that A and B are sets such that n(A) = 8, n(B) = 12 and n(A ∩ B) = 3, find n(A ∪ B).
Answer: B (17)
n(A ∪ B) = n(A) + n(B) − n(A ∩ B) = 8 + 12 − 3 = 17.