Reasoning • Logical Reasoning

Syllogism Basics

basic Level

Formula

All A are B. All B are C. Therefore, All A are C.

Explanation

Universal statement about relationships between three groups.

Example

All flowers are plants. All plants are living. Therefore, all flowers are living.

Quick Trick & Mnemonic

QUICK TRICK: Look for middle term (B). It connects premise 1 to premise 2. Draw circles (Venn diagrams).

Use overlapping circles to represent relationships between sets.

Analogy

A is to B as C is to D: A:B :: C:D

Series

Series: a, a+d, a+2d, a+3d... where d is common difference. nth term = a + (n-1)d