Question Bank - Logical Reasoning

Here's the question bank on all the logical reasoning topics.

Name the fallacy committed in"Some good actors are not strong men.All professional wrestlers are strong men.Therefore, All professional wrestlers are good actors."

A.
Illicit major
B.
Illicit minor
C.
Undistributed middle
D.
Affirmative conclusion from Negative Premises

Solution:

The correct answer is an Affirmative conclusion from a negative premise (illicit negative).Important PointsAffirmative conclusion from a negative premise (illicit negative)It is a formal fallacy that is committed when a categorical syllogism has a positive conclusion and one or two negative premises"Some good actors are not strong men is a negative premise All professional wrestlers are strong men. is a positive premise Therefore, All professional wrestlers are good actors." this is a positive conclusionTherefore the fallacy in the question asked is an Affirmative conclusion from a negative premise (illicit negative) fallacy. Additional InformationIllicit major fallacy:It is a formal fallacy committed in a categorical syllogism that is invalid because its major term is undistributed in the major premise but distributed in the conclusion. This fallacy has the following argument form: All A are B. No C is A.Illicit minor fallacyIt is a formal fallacy committed in a categorical syllogism that is invalid because its minor term is undistributed in the minor premise but distributed in the conclusion. This fallacy has the following argument form: All A are B. All A are CThe fallacy of the undistributed middle:It is a formal fallacy that is committed when the middle term in a categorical syllogism is not distributed in either the minor premise or the major premiseIn this example, distribution is marked in boldface:All Z is BAll Y is BTherefore, all Y is ZB is the common term between the two premises (the middle term) but is never distributed, so this syllogism is invalid.B would be distributed by introducing a premise that states either All B is Z, or Some B is Z.

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