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Which one of the following formal fallacies is committed in the given argument? All snakes are reptiles. Some snakes are poisonous creatures.
Question



Which one of the following formal fallacies is committed in the given argument?
All snakes are reptiles.
Some snakes are poisonous creatures.
Therefore, all poisonous creatures are reptiles.

A.

Fallacy of Illicit process of major term

B.

Fallacy of Illicit process of minor term

C.

Fallacy of undistributed middle term

D.

Fallacy of four terms

Correct option is B


The fallacy committed in the argument is the Fallacy of Illicit Process of the Minor Term. This occurs when the minor term (here, "poisonous creatures") is distributed in the conclusion but not in the premises.
Here’s the breakdown:
1. Premise 1 (Major premise): "All snakes are reptiles" does not involve "poisonous creatures."
2. Premise 2 (Minor premise): "Some snakes are poisonous creatures" introduces "poisonous creatures," but it is not distributed because it refers to only some snakes.
3. Conclusion: "All poisonous creatures are reptiles" improperly distributes the minor term "poisonous creatures," which was not distributed in the premise.
Information Booster 1. Illicit Process of the Minor Term: Occurs when the minor term is distributed in the conclusion but not in the premises.
2. Distribution of Terms: A term is considered distributed if it applies to all members of the category it denotes.
3. Universal Quantifiers: Statements like "All snakes are reptiles" do not distribute the predicate ("reptiles").
4. Particular Quantifiers: Statements like "Some snakes are poisonous creatures" do not distribute either term.
5. Valid Argument: For a syllogism to be valid, any term distributed in the conclusion must also be distributed in the premises.
Additional Knowledge
Fallacy of Illicit Process of Major Term
· This occurs when the major term is distributed in the conclusion but not in the premises.
· Example: "All A are B. Some B are C. Therefore, all C are A."
Fallacy of Undistributed Middle Term
· This occurs when the middle term is not distributed in at least one premise.
· Example: "All A are B. All C are B. Therefore, all A are C."
Fallacy of Four Terms
· This occurs when there are more than three terms in a syllogism, breaking its logical structure.
· Example: "All A are B. All C are D. Therefore, all A are D."

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