If the crime occurred after 4:00 a.m., then Smith could not have done it. If the crime

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If the crime occurred after 4:00 a.m., then Smith could not have done it.
If the crime occurred at or before 4:00 a.m., then Jones could not have done it.
The crime involved two persons, if Jones did not commit the crime.
Therefore, if Smith committed the crime, it involved two persons.


Use a symbolic argument in Problems 29–32 to determine if the argument is valid or invalid.

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