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    A Concise Introduction to Logic
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    Exam 4: Categorical Propositions
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    All Trolls Are Ugly Creatures
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All Trolls Are Ugly Creatures

Question 371

Question 371

Multiple Choice

All trolls are ugly creatures. Therefore, no trolls are beautiful creatures.


A) Invalid; illicit obversion.
B) Invalid; illicit contrary.
C) Invalid; existential fallacy.
D) Invalid; illicit contraposition.
E) Valid; no fallacy.

Correct Answer:

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