The Venn Diagram Method
The Venn Diagram Method
The Venn diagram method is the safest way to solve any syllogism, because it turns abstract logic into a picture you can simply read. You draw circles for each term, arrange them to match the statements, and then check each conclusion against the drawing. In SBI Clerk this method handles every set without exception, so learning to draw the four statement types quickly is the core skill of the whole chapter.
Drawing the Four Statement Types
Each statement type has a fixed picture. 'All A are B' is a small A circle sitting entirely inside a larger B circle. 'No A are B' is two circles that do not touch at all. 'Some A are B' is two circles that overlap in a shared region. 'Some A are not B' also overlaps, but you mark the part of A that lies outside B. Draw these mechanically, exactly as written, without imagining any extra relationship the statement did not actually state.
| Statement | Diagram | What the picture shows |
|---|---|---|
| All A are B | A inside B | Every A is a B |
| No A are B | Separate circles | No shared region |
| Some A are B | Overlapping circles | A shared middle exists |
| Some A are not B | Overlap, mark A-only part | Part of A lies outside B |
Check Conclusions Against the Diagram
Once the statements are drawn, read each conclusion off the picture. A conclusion follows only if it is true in the diagram you were forced to draw. If the statements let you draw the arrangement in more than one way, a conclusion follows only when it holds in every possible drawing. This 'true in all cases' test is the heart of the method and the reason a picture beats verbal reasoning: the eye checks in a second what words take a paragraph to argue.
Solved Examples
Example: Statements: 'All Morks are Zephyrs', 'All Zephyrs are Table'. Draw Mork inside Zephyr inside Table. Conclusion 'All Morks are Table' is true in the picture — Mork sits fully inside Table — so it follows. Conclusion 'All Table are Morks' fails, since Table is the outer circle.
✗ Drawing an overlap the statements never stated | ✓ Drawing only what each statement literally forces
When Multiple Drawings Are Possible
Many statement pairs can be drawn in more than one valid way, and this is exactly where careless candidates trip. If 'Some A are B' and 'All B are C' are given, the A circle can overlap C fully or only partly, so you must picture both. A conclusion counts as definite only if it survives every legal arrangement you can draw; if even one drawing breaks it, the conclusion does not follow. The practical habit is to draw the most 'spread out' arrangement first, the one that keeps circles as separate as the statements allow, because that drawing exposes conclusions that looked true in a cosier picture but are not actually forced. Testing the loosest case is how you avoid marking a merely possible conclusion as definite.
प्रत्येक कथन का एक निश्चित चित्र है — All: अंदर, No: अलग, Some: अतिव्यापन। निष्कर्ष तभी मान्य जब वह हर संभव चित्र में सत्य हो।
Exam Pointer — In SBI Clerk, the Venn method solves every syllogism question, so never guess verbally. Draw the statements exactly as printed, then read conclusions off the picture. The examiner designs traps around arrangements you failed to draw, so when a pair allows two pictures, draw both before deciding — this alone prevents most wrong answers.
60-Second Recap
- All = inside, No = separate, Some = overlap, Some-not = marked overlap.
- A conclusion follows only if true in every possible drawing.
- Draw only what the statement literally forces.
- When two drawings are possible, test both before deciding.