Definition: Syllogism — Psychometric Glossary
A syllogism is a logical reasoning composed of two premises leading to a necessary conclusion. Fundamental for the logic section of the psychometric test.
- Complete definition with classic examples
- Understanding the premises-conclusion structure
- Syllogism exercises for the psychometric test
- Identifying valid and invalid syllogisms
What is a syllogism?
A syllogism is a form of deductive reasoning composed of two premises (a major and a minor) that lead to a logically necessary conclusion. Classic example: 'All men are mortal. Socrates is a man. Therefore, Socrates is mortal.'
The validity of a syllogism depends on its logical structure, not the truth of its premises. A syllogism can be formally valid even if its premises are false.
Syllogisms in the psychometric test
In the logic section of the psychometric test, syllogisms appear as reasoning to evaluate. You are asked to determine whether a conclusion logically follows from the given premises.
Common traps include syllogisms that seem intuitively true but are logically invalid, and vice versa. You must focus on the formal structure of the reasoning.
How to practice syllogisms
Here are the steps to master syllogisms:
- Identify the premises : Clearly spot the major premise and the minor premise before evaluating the conclusion.
- Ignore your knowledge : Evaluate only the logical structure, not the truth of the content in the real world.
- Use diagrams : Venn diagrams can help visualize the relationships between sets.
Frequently asked questions
What is the difference between a syllogism and an inference?
A syllogism is a specific type of deductive inference with exactly two premises and one conclusion. Inference is a more general term that encompasses any reasoning that allows drawing a conclusion from given information.
How to know if a syllogism is valid?
A syllogism is valid if the conclusion necessarily follows from the premises, regardless of their truth. Use Venn diagrams or formal logic rules to verify validity.
Are syllogisms common in the test?
Yes, syllogistic reasoning is at the core of the logic/deduction section of the psychometric test. Mastering syllogisms is essential for a good score in this section.
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