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WAEC Mathematics 1991 (August) Question 30

Question 30

Sets

P = {2, 1, 3, 9, ½}, Q = {1, 2½, 3, 7} and R = {5, 4, 2½}
Find P∪Q∪R.

  1. A.{2½}
  2. B.{1, 9}
  3. C.{1, 2, 3, 4, 5, 6, 7}
  4. D.{5, 4, 2½}
  5. E.{½, 1, 2, 2½, 3, 4, 5, 7, 9}
Show the answer and explanation

Answer: E ({½, 1, 2, 2½, 3, 4, 5, 7, 9})

Explanation

The union lists every element that is in at least one set: ½, 1, 2, 2½, 3, 4, 5, 7, 9.