If an argument is valid and it has false premises, then
it must have a false conclusion
. A valid argument with false premises may still have a true conclusion. If an argument is invalid and the premises are both true, then the conclusion must be false. … If an argument is unsound, then it must be invalid.
Can a valid argument have all true premises and a false conclusion?
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. … If an invalid argument has all true premises, then the conclusion must be false.
Could there be a valid argument that has one false premise and one true premise?
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
. … If an invalid argument has all true premises, then the conclusion must be false.
Does every valid argument have a true conclusion?
FALSE:
A valid argument must have a true conclusion only if all of the premises are true
. So it is possible for a valid argument to have a false conclusion as long as at least one premise is false. 2. A sound argument must have a true conclusion.
Is it possible for an invalid argument to have a true conclusion quizlet?
A valid argument with false premises
What can an argument with false premises not be?
In the case of an argument which actually has false premises, it takes a short story or fictional work to do this. Such an argument is
UNSOUND
because the argument does NOT have true premises. … For either example, the logic is valid but the premises are false. For the premises to be true, all of them need to be true.
What is false premise example?
A false premise is an incorrect proposition that forms the basis of an argument or syllogism. Since the premise (proposition, or assumption) is not correct, the conclusion drawn may be in error. … For example, consider this syllogism, which involves a false premise:
If the streets are wet, it has rained recently
.
Can a deductive argument have a false conclusion?
A valid deductive argument can have all false premises
and a false conclusion. … Whether an argument is valid has nothing to do with whether any of it's premises are actually true. 10. No sound deductive argument has a false premise.
Can a cogent argument have a false conclusion?
A cogent inductive argument
Can an unsound argument have a true conclusion?
It should be noted that both invalid, as well as valid but
unsound, arguments can nevertheless have true conclusions
. One cannot reject the conclusion of an argument simply by discovering a given argument for that conclusion to be flawed.
What is a valid argument PHI103?
To say an argument is cogent is
to say it is good, believable; there is good evidence that the conclusion is true
. A weak argument cannot be cogent, nor can a strong one with a false premise(s). The concept of true premises sometimes bothers people.
Is thus a conclusion indicator?
A conclusion indicator is a
word or phrase that indicates that the statement it's attached to is a conclusion
. … Of the indicators we've seen so far, “thus,” “so,” and “hence” are also conclusion indicators, as can be verified in any reliable dictionary.
What is an invalid argument?
Invalid:
an argument that is not valid
. We can test for invalidity by assuming that all the premises are true and seeing whether it is still possible for the conclusion to be false. If this is possible, the argument is invalid. Validity and invalidity apply only to arguments, not statements.
Do all fallacious arguments have false premises?
Accordingly, the fallacy fallacy
Can a strong inductive argument have false premises?
This argument is inductively strong because if all its premises were true, then it would be highly likely or probable that its conclusion would also true. Inductively strong arguments may have: …
False premises
, false conclusion. False premises, true conclusion.
What logical conclusion can you draw about an argument that is valid but has a false conclusion?
What logical conclusion can you draw about an argument that is valid but has a false conclusion? This
argument must have at lease one false premise
