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WAEC Mathematics 1995 Question 9

Question 9

Sets

If R = [2, 4, 6, 7] and S = [1, 2, 4, 8], then R∪S equal

  1. A.[1,2,4,6,7,8]
  2. B.[1,2,4,7,8]
  3. C.[1,4,7,8]
  4. D.[2,6,7]
  5. E.[2,4].
Show the answer and explanation

Answer: A ([1,2,4,6,7,8])

Explanation

The union contains every element in R or S: {1, 2, 4, 6, 7, 8}.