Validity And Soundness - Practice Exercises
Determine whether each of the following arguments are VALID and/or SOUND. Remember: A valid argument is one whose conclusion is guaranteed if we assume that its premises are true, and a sound argument is one that is valid and also has true premises.
- 1.Either President Lincoln was assassinated, or he was killed in an accident. President Lincoln was not killed in an accident. Therefore, President Lincoln must have been assassinated.
- A.
Check here if the argument is VALID.
- B.
Check here if the argument is SOUND.
- C.
Check here if the argument is NEITHER valid NOR sound.
- 2.Either Princess Diana was assassinated, or she was killed in an accident. Princess Diana was not killed in an accident. So Princess Diana must have been assassinated.
- A.
Check here if the argument is VALID.
- B.
Check here if the argument is SOUND.
- C.
Check here if the argument is NEITHER valid NOR sound.
- 3.It is January.January is in the wintertime.So it must be winter.
- A.
Check here if the argument is VALID.
- B.
Check here if the argument is SOUND.
- C.
Check here if the argument is NEITHER valid NOR sound.
- 4.It is February.February is in the wintertime.So it must be snowing.
- A.
Check here if the argument is VALID.
- B.
Check here if the argument is SOUND.
- C.
Check here if the argument is NEITHER valid NOR sound.
- 5.February 17th is Ash Wednesday.February 17th is this Wednesday.So this Wednesday must be Ash Wednesday.
- A.
Check here if the argument is VALID.
- B.
Check here if the argument is SOUND.
- C.
Check here if the argument is NEITHER valid NOR sound.
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