Hastings & Rother

Logical Exercises (2)

Brief guide to your logical competence
Please answer the following question in all seven arguments below:

Question 2: Is this a SOUND argument? If yes, why?
Please remember that, a SOUND argument is a VALID argument with true premises.

Argument type 7: - False Premises, True Conclusion
Cats are birds.
Tigers are birds.
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Therefore, tigers are cats.

Argument type 3: - True Premises, True Conclusion
Cats are mammals.
Tigers are mammals.
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Therefore, tigers are cats.

Argument type 4: - False Premises, False Conclusion
Dogs are cats.
Cats are birds.
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Therefore, dogs are birds.

Argument type 5: - False Premises, False Conclusion
Cats are birds.
Dogs are birds.
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Therefore, dogs are cats.

Argument type 6: - False Premises, True Conclusion
Cats are birds.
Birds are mammals.
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Therefore, cats are mammals.

Argument type 2: - True Premises, True Conclusion
Cats are mammals.
Tigers are cats.
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Therefore, tigers are mammals.

Argument type 1: - True Premises, False Conclusion
Cats are mammals.
Dogs are mammals.
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Therefore, dogs are cats.