Can an argument be sound and fallacious?

An argument is valid if the conclusion must be true whenever the premises are true. An argument that is not valid is invalid or fallacious. If an argument is valid and its premises are true, the argument is sound. If an argument is not sound it is unsound.

Can an argument contain an informal fallacy and still be valid?

An informal fallacy is described as: In contrast to a formal fallacy, an informal fallacy originates in a reasoning error other than a flaw in the logical form of the argument. A deductive argument containing an informal fallacy may be formally valid, but still remain rationally unpersuasive.

Is it possible to have a sound argument that is also valid?

TRUE: If an argument is sound, then it is valid and has all true premises. TRUE: A valid argument cannot have all true premises and a false conclusion. So if a valid argument does have a false conclusion, it cannot have all true premises. Thus at least one premise must be false.

Can informal fallacies be valid deductive arguments?

Since deductive arguments depend on formal properties and inductive arguments don’t, formal fallacies apply only to deductive arguments. Informal fallacies are defects found in the content of the argument, which could be inductive or deductive. There are many ways arguments can be defective.

Can an argument be valid with false premises?

A valid argument can have false premises; and it can have a false conclusion. But if a valid argument has all true premises, then it must have a true conclusion.

Can an argument be invalid and sound?

Question originally answered: Can a sound argument be invalid? No, it cannot. A sound argument is defined as a valid argument, with the extra property that the premises of the argument are true.

What is the difference between formal argument from invalid arguments?

Valid: an argument is valid if and only if it is necessary that if all of the premises are true, then the conclusion is true; if all the premises are true, then the conclusion must be true; it is impossible that all the premises are true and the conclusion is false. If this is possible, the argument is invalid.

Are fallacies always invalid?

Originally Answered: Does a fallacy always invalidate an argument? Yes, logically a fallacy invalidates the argument, though it’s possible to be presenting multiple arguments at once, and if so it only invalidates the argument that rests on the fallacy.

How do you know if an argument is valid and sound?

First, one must ask if the premises provide support for the conclusion by examing the form of the argument. If they do, then the argument is valid. Then, one must ask whether the premises are true or false in actuality. Only if an argument passes both these tests is it sound.

Can a fallacious argument ever be a good argument?

The first of those accounts says that an argument is good if and only if it is valid and has true premises (Feldman, p. And even deductive arguments can be good arguments if they contain false, but justified, premises (Feldman, p. 166). So a good argument need not be valid nor have true premises.

Can a sound argument be invalid?

What makes an argument valid?

An argument is valid if the premises and conclusion are related to each other in the right way so that if the premises were true, then the conclusion would have to be true as well.