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WAEC Mathematics 1993 Question 1

Question 1

Sets

S = {1, 2, 3, 4, 5, 6}, T = {2, 4, 5, 7} and R = {1, 4, 5}, find (S∩T)∪R

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

Answer: C ({1, 2, 4, 5})

Explanation

S∩T = {2, 4, 5}. Joining R = {1, 4, 5} gives {1, 2, 4, 5}.