A deductive argument is invalid if :
2017
A deductive argument is invalid if :
- A.
Its premises and conclusion are all true.
- B.
Its premises and conclusion are all false.
- C.
Its premises are all false but its conclusion is true.
- D.
Its premises are all true but its conclusion is false.
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Correct answer: D
This is the very definition of invalidity. The entire purpose of a valid deductive argument is that if the premises are true, the conclusion must also be true. If it's possible for the premises to be true while the conclusion is false, the argument's structure is invalid.
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