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JAMB Mathematics 2014 Question 10

Question 10

Sets

If P = {1,2,3,4,5} and P∪Q = {1,2,3,4,5,6,7}, list the elements in Q.

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

Answer: D ({6, 7})

Explanation

6 and 7 are in the union but not in P, so they must come from Q. The only option containing both is {6, 7}.