an example of this is like taking a statement and making it negative, i think....
Such as, "All animals living in the ocean are fish." A counterexample would be a whale(mammal), proving this statement false.
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non-example, counterexample,
A counterexample.
a number wich disproves a proposition For example, theprime number 2 is a counterexample to the statement "All prime numbers are odd."
a number wich disproves a proposition For example, theprime number 2 is a counterexample to the statement "All prime numbers are odd."
There is no counterexample because the set of whole numbers is closed under addition (and subtraction).