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OAU Post-UTME Mathematics 2022 (Batch A) Question 5

Question 5

Sets

A = {x : x is odd and x < 10}, B = {2, 3, 5, 7, 11, 13}, find n(A∩B).

  1. A.{3, 5, 7}
  2. B.3
  3. C.{1, 3}
  4. D.2
Show the answer and explanation

Answer: B (3)

Explanation

A = {1, 3, 5, 7, 9}, so A∩B = {3, 5, 7}. n( ) asks for the number of elements, which is 3.