WAEC Mathematics 2025 Question 11

Question 11

Sets

The sets M = {x: 2 ≤ x ≤ 6} and N = {x: 4 ≤ x ≤ 8} are subsets of μ = {x: 1 ≤ x ≤ 10, where x is an integer}. Find M′ ∩ N′

  1. A.{1, 7, 8}
  2. B.{1, 8, 9}
  3. C.{1, 9, 10}
  4. D.{1, 8, 10}
Show the answer and explanation

Answer: C ({1, 9, 10})

Explanation

M′ = {1, 7, 8, 9, 10} and N′ = {1, 2, 3, 9, 10}; the common elements are 1, 9 and 10.