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WAEC Mathematics 2008 Question 33

Question 33

Sets

Every staff in an office owns either a Mercedes and/or a Toyota car. 20 own Mercedes, 15 own Toyota and 5 own both. How many staff are there in the office?

  1. A.25
  2. B.30
  3. C.35
  4. D.45
Show the answer and explanation

Answer: B (30)

Explanation

n(M ∪ T) = 20 + 15 − 5 = 30.