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WAEC Further Mathematics 2012 Question 26

Question 26

Functions

In the diagram, g : x → y and h : y → z. Use the diagram to answer questions 25 and 26. g o h is

Diagram for this question
  1. A.one to one
  2. B.one onto
  3. C.a relation
  4. D.a series
Show the answer and explanation

Answer: B (one onto)

Explanation

Following g then h, every element of Z is reached (onto), but 2 and 3 both end at β, so it is not one-to-one.