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OAU Post-UTME Mathematics 2013 Question 16

Question 16

Sets

If X = {2,3,6,7,8} and Y = {6,7,10,3,17}, find X∩Y

  1. A.{ }
  2. B.3,6,7
  3. C.{2,3,6,7,8,10,17}
  4. D.{6,3,7}
Show the answer and explanation

Answer: D ({6,3,7})

Explanation

The common elements are 3, 6 and 7. Written as a set (in curly brackets) that is {6, 3, 7}; order does not matter.