Propositional Logic Worksheet Page 3

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Example: Another disjunctive syllogism example
Ladybugs are purple or green.
Ladybugs are not green.
Therefore ladybugs are purple.
Let P be: Ladybugs are purple.
Let Q be: Ladybugs are green.
Rewritten argument:
P or Q
not Q
Therefore P
This argument is valid, but it isn’t very meaningful since P and Q
are not true.
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