Table of Contents
Can a premise be true and a conclusion be false?
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.
Can the conclusion of a deductive argument be false?
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. Otherwise, a deductive argument is unsound.
Do premises have to be true in deductive argument?
A deductive argument is valid when you have the following: If all its premises were true, then its conclusion must be true, by necessity. To determine if an argument is valid or invalid (not valid): First assume that the premises are true, even if they are not; pretend that they are true.
Can a deductive argument have more than two premises?
Of course, more complex deductive arguments may have more than two premises. In many cases arguments are linked together. The conclusion of one argument becomes a premise for the next argument. In analyzing complex arguments, it is often important to break the argument down into its component parts.
What is an argument with false premises and false conclusion?
So, an argument with a mixture of true and false premises is still considered to be an argument with false premises–it is false that all of the premises are true. Nevertheless, in these examples, the conclusion is false. For either example, the logic is invalid and the premises are false. Here the conclusion is false.
Can a valid deductive argument ever have false premises Why or why not quizlet?
No, it’s not possible. A deductively valid argument is such that if the premises are true , its conclusion must be absolutely, positively be true.
Can a valid deductive argument ever have false premises Why or why not p 44?
Can a valid deductive argument ever have false premises? Yes, it can. “The validity or invalidity of an argument is a matter of its form, not its content.
What are the relationships between premises and conclusions?
A premise is a statement in an argument that provides reason or support for the conclusion. There can be one or many premises in a single argument. A conclusion is a statement in an argument that indicates of what the arguer is trying to convince the reader/listener.
When the conclusion follows from the premises the argument is?
A deductive argument is one in which it is claimed that the conclusion follows necessarily from the premises. In other words, it is claimed that under the assumption that the premises are true it is impossible for the conclusion to be false.
Can an argument have 3 premises?
Three Premise Arguments means that there are 3 statements and 1 or more conclusions. These are same as the two premise arguments. They are also represented in the form of Venn Diagrams.
Can a valid argument have false premises and a false conclusion?
A valid argument can have false premises; and it can have a false conclusion. But ifa valid argument has all true premises, then it must have a true conclusion. 7. FALSE. A sound argument is both valid and has all true premises. Since a sound argument is valid, it is such that ifall the premises are true then the conclusion must be true.
Do all deductive arguments have a true premise?
Some Deductive arguments have true premises, ant yet they are invalid. All sound arguments are valid arguments. If an argument is valid, then it must have at least one true premise. Every valid argument is a sound argument.
What is true and false in deductive logic?
PHIL 213: Deductive Logic Larkin: Fall 2003 First Test Review Problems I. True/False Questions: 1.1 B 1. FALSE. A valid argument can have all true premises (making it sound as well as valid). 2. TRUE. This is just the definition of an argument. 3. FALSE. A valid argument can have false premises.
Does a sound argument have to have a true conclusion?
FALSE. A sound argument is both valid and has all true premises. Since a sound argument is valid, it is such that ifall the premises are true then the conclusion must be true. Since a sound argument also has all true premises, it follows that a sound argument must have a true conclusion.