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A cogent argument may have a false conclusion.

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The following diagram matches the following categorical syllogism:

Some M are not P.

Some S are M.

Some S are not P.

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Which of the following is not an extensional (denotative) definition?

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The statement "Some S are not P" does not necessarily imply that Some S are P.
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When fallacies occur in ordinary language usage, they are usually clear-cut and easily recognizable.

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Based on the Mood & Figure chart below, the following categorical syllogism is valid:

Some

dummies are not allowed in this class.

My

boyfriend is a dummy.

Therefore,

my boyfriend is not allowed in this class.

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Which of the following categorical syllogism is invalid based on Mood & Figure chart below?

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In categorical propositions, subjects and predicates that are linked by copula are interchangeable. In other words, copula can act like an equal (=) sign. So "All students are studying" can have the same meaning as "All those who are studying are students."

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The following diagram matches the following categorical syllogism:

Some M are not P.

Some S are M.

Some S are not P.

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Every deductive argument must have a valid logical form.
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