Apr 22, 2018 · Question 16 0 / 1 pts If an argument is valid, which of the following cannot be true? all of its premises are true You Answered its conclusion is false Correct Answer all of its premises are true and its conclusion is false the argument is unsound The answer can be found in Section 3.2, “Categorical Logic: Evaluating Deductive Arguments,” of With Good Reason: A Guide to …
The answer is It shows that the premises are true and the conclusion is false because a case that demonstrates that an argument can have correct premises but a faulty conclusion is known as a counter-example. Remember that an argument is valid if the premises cannot be true and the conclusion is false, and it is strong if the premises cannot be true and the conclusion is false.
A valid argument cannot have a false conclusion a. - A valid argument cannot have a false conclusion. (a) True (b) False. (2) Determine whether an argument is best classified as being deductive or inductive. For example, on the test you might see something like the following problem: -Every orange has seeds.
If the argument is valid, which means the premises leads to only one conclusion, the conclusion must be true if the premises are true. It is necessary for the premises are all true that the conclusion must also be true. Otherwise, either the premise is false or the argument is not valid if the conclusion is not true
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.
2. A sound argument must have a true conclusion. TRUE: If an argument is sound, then it is valid and has all true premises. Since it is valid, the argument is such that if all the premises are true, then the conclusion must be true.
A deductive argument is said to be valid if and only if it takes a form that makes it impossible for the premises to be true and the conclusion nevertheless to be false. Otherwise, a deductive argument is said to be invalid.
Definition: A strong argument is a non-deductive argument that succeeds in providing probable, but not conclusive, logical support for its conclusion. A weak argument is a non-deductive argument that fails to provide probable support for its conclusion.
For either argument, the logic is valid. And, both the premises and the conclusion are true. Indeed, by definition, any valid argument with true premises will also have a true conclusion.
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. ... Since a sound argument is valid, it is such that if all the premises are true then the conclusion must be true.
An argument is a set of initial statements, called premises, followed by a conclusion. An argument is valid if and only if in every case where all the premises are true, the conclusion is true. Otherwise, the argument is invalid.Feb 6, 2021
Example. The argument “All cats are mammals and a tiger is a cat, so a tiger is a mammal” is a valid deductive argument. Both the premises are true. To see that the premises must logically lead to the conclusion, one approach would be use a Venn diagram.
There are many invalid argument forms....Invalid argument forms.Valid argument formPseudo-valid argument formdisjunctive syllogism / process of elimination p or q not p Therefore qfalse dilemma p or q p Therefore not q2 more rows
The truth of the premises doesn't guarantee the truth of the conclusion. That's ALL it means to call an argument "invalid". In particular, it doesn't imply that the argument is bad. As we'll see in the next lecture, invalid arguments can still be good arguments.
An argument may be weak, therefore, because it is ill-formed. Or in cases where it is valid or cogent, then it may be weak because you fail to believe that the premises are true. You may disagree with one or more of the premises, or you may be inclined to suspend judgement.
If a deductive argument is valid, then we go ahead and check the factual claim, because only then is it possible that the argument might be sound. An invalid argument is always unsound. An argument is sound if it is valid and the premises are all actually true.