Select the correct answer from each drop-down menu.
How are evidence and counterexamples used in proofs?
In a direct proof, evidence is used to
. On the other hand, a counterexample is a single example that
.

Respuesta :

Evidence are simply facts to support a claim, while counterexamples are instances to show the contradictions in a claim

The question is incomplete, as the required drop-down menus are missing. So, I will give a general explanation

To show that a statement is true, you need evidence.

Take for instance:

[tex]\mathbf{if\ a^2 = 4,\ then\ a = 2}[/tex]

The evidence that the above proof is true is by taking the squares of both sides of [tex]\mathbf{a = 2}[/tex]

[tex]\mathbf{a^2 = 2^2}[/tex]

[tex]\mathbf{a^2 = 4}[/tex]

However, a counterexample does not need a proof per se.

What a counterexample needs is just an instance or example, to show that:

[tex]\mathbf{if\ a^2 = 4,\ then\ a \ne 2}[/tex]

An instance to prove that: [tex]\mathbf{if\ a^2 = 4,\ then\ a = 2}[/tex] is false is:

[tex]\mathbf{a = -2}[/tex]

Hence, the complete statement could be:

In a direct proof, evidence is used to support a proof . On the other hand, a counterexample is a single example that shows that a proof is false.

Read more about evidence and counterexample at:

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