You can prove that a statement is
not true by using a
counter example. All you have to do is find just one example which does not work for the statement.
Disproof by counter example involves:
- Find one example that does not work for the statement to be disproved.
Prove that the following statement is not true:
The product of two prime numbers is always odd.
Pick two prime numbers for which the product is even, such as:
\[2×5=10\]
Therefore the product of two prime numbers is not always odd.
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