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- Counterexamples of numbers include123:
- A rational number that is not positive (e.g., -5)
- An even prime number (e.g., 2)
- A quadratic equation with only one root (e.g., x^2 = 0)
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Example: Tell whether the statement is True or False, then if it is false, find a counter example: If a number is a rational number, then the number is positive. Solution: This statement is false, -5 is a rational number but not positive.www.khanacademy.org/test-prep/praxis-math/praxi…To give a counterexample, I have to find an integer n such n2 is divisible by 4, but n is not divisible by 4 — the “if” part must be true, but the “then” part must be false.sites.millersville.edu/bikenaga/math-proof/countere…Examples of Counterexamples in Mathematics:
- Prime numbers: The statement “all prime numbers are odd” is false because the counterexample of 2 shows that there is at least one even prime number. Therefore, 2 is a counterexample to the statement.
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