Validity And Soundness - Practice Exercises

5 Questions | By Jlschwenkler | Updated: Mar 22, 2022 | Attempts: 8359

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.

Questions and Answers

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.