ࡱ> 7 ! bjbjUU @7|7|! l---- -E........DDDDDDD$E GxD.....D...D......D..D../:4,4.. 3N,-.B4 4D0EL4RiH.iH4. Sample Exam I key 1) True 2) False 3) True 4) False 5) False A sound argument is one which is both VALID and has all true premises. Since a valid argument is one in which the truth of the premises guarantees the truth of the conclusion, it follows that the conclusion of a sound argument MUST be true. So, any argument with a false conclusion is unsound. I would use a consistency checker to test for validity in the following way. We know that in a valid argument it is impossible for the premises to be true while the conclusion is false. Accordingly, the set {all true premises, false conclusion} must be inconsistent. SO, I would run the set of statements {all true premises, false conclusion} through the consistency checker. If that set is consistent, the argument is non-valid. If the set is inconsistent, then the argument is valid. 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