Post-UTME Mathematics 2013 Objective — Question 20
Question 20 of 100 from the Post-UTME Screening (Post-UTME) Mathematics 2013 Objective paper, with the correct answer and a full explanation.
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Which of the following binary operations is commutative in the set of integers?
- A. a-b=a-2b
- B. a.b=a+b-abCorrect
- C. a-b=a²-b
- D. a.b=a(b+1)/2
Explanation
a+b-ab is symmetric in a and b (addition and multiplication are both commutative), so a*b=b*a.
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