An argument is valid if it would be contradictory(impossible) to have the premises all true and conclusion false. It doesn’t mean the premises are true. If the premises were all true, then the conclusion would have to be true. The conclusion should follow from the premises
For check the valid arguments, we assume the premises are true and the assumed conclusion necessarily follows from the premises.
Valid Arguments
All cats are evil - (assumes true)
Garfield is a cat - (assumes true)
Therefore, Garfield is evil
Invalid Arguments
- All men are mortal
- Socrates is a mortal
- Socrates is a man
