Question

Which of the following is a counterexample to the following statement? Subtraction of whole numbers is commutative. n + s ≠ n - s 4 - 3 ≠ 3 - 4 10 - 0 ≠ 10 2 - (4 - 3) ≠ (2 - 4) - 3

Answer 1

A counterexample is an example that disproves a proposition. In the proposition, "Subtraction whole numbers is commutative", we are being told that

A - B = B - A

Well we can see that is not true by stating

4-3 does not = 3-4

so that is the correct counterexample.