Syllogism Questions for SSC CGL

The Four Basic Statement Types

Every syllogism is built from four types of statements. Think of them as building blocks. Each statement has a Subject (S) and a Predicate (P). The type tells you how many of S are connected to P. You must identify the type before applying any rule.

• A-type (Universal Positive): All S are P. Example: All cats are animals.
• E-type (Universal Negative): No S is P. Example: No cat is a dog.
• I-type (Particular Positive): Some S are P. Example: Some cats are black.
• O-type (Particular Negative): Some S are not P. Example: Some cats are not black.
• Mnemonic: A E I O — like vowels in order. A and I are positive (Affirm), E and O are negative (dEny/sOme-not).

Distribution of Terms — The Core Rule Engine

A term is said to be distributed if the statement talks about ALL members of that term. This is the engine behind valid conclusions. You need to know which terms are distributed in which statement type.

• A-type: Subject is distributed, Predicate is NOT distributed.
• E-type: Both Subject and Predicate are distributed.
• I-type: Neither Subject nor Predicate is distributed.
• O-type: Only Predicate is distributed.
• Mnemonic: AEIO distribution — A distributes Subject only, E distributes Both, I distributes Neither, O distributes Object (Predicate) only. Remember: A-S, E-B, I-N, O-P.

The Venn Diagram Method — Faster for SSC

Most SSC CGL students find Venn diagrams faster than distribution rules during the exam. Draw circles for each category and shade or mark overlaps based on the statements. Then check if the conclusion must be true in ALL possible diagrams, not just one. If even one valid diagram breaks the conclusion, it does not follow.

• All A are B: Draw circle A completely inside circle B.
• No A is B: Draw circles A and B completely separate.
• Some A are B: Draw circles A and B overlapping partially.
• Some A are not B: Part of A is outside B — draw A partially outside B.
• A conclusion follows ONLY if it is true in every possible Venn diagram, not just one arrangement.

Either-Or (Complementary Pair) Conclusions

SSC CGL loves this trick. When neither conclusion I nor conclusion II individually follows, but together they cover all possibilities (one is I-type and the other is O-type for the same subject and predicate), then Either I or II follows. This is called a complementary pair.

• Complementary pair condition: One conclusion is Some A are B (I-type) and the other is Some A are not B (O-type) for the same A and B.
• Neither conclusion alone follows, but together they are exhaustive — so Either-Or follows.
• This does NOT apply to A-type and E-type pairs.
• Watch out: If one of the conclusions does follow on its own, do NOT choose Either-Or — choose that conclusion directly.
• Common SSC trap: Statements give no direct conclusion, but the I and O pair is present — answer is Either I or II follows.

Quick Combination Table for Two-Statement Syllogisms

In SSC CGL, most questions have two premises. This table tells you the type of conclusion you can draw based on the combination of premise types. Memorize it like a multiplication table.

• A + A = A conclusion (All + All = All)
• A + E = E conclusion (All + No = No)
• E + A = O-type reversed conclusion (No + All = Some not)
• A + I = I conclusion (All + Some = Some)
• I + A = I conclusion (Some + All = Some)
• E + I = O-type conclusion (No + Some = Some not)
• I + E = O-type reversed (Some + No = Some not reversed)
• All other combinations: No valid conclusion.

• Using real-world knowledge: If the statement says All elephants are pens, you must accept it. Never reject a conclusion because it sounds absurd in real life.
• Forgetting the Either-Or rule: When both conclusions seem wrong, many aspirants mark Neither follows. Always check if they form a complementary I and O pair first.
• Concluding universally from particular premises: Two I-type premises never give any conclusion. Many students still write Some A are C — that is wrong.
• Reversing the middle term direction: The middle term must appear in BOTH premises. If the same term is not in both, you cannot connect the dots — no conclusion follows.
• Marking a conclusion valid from only one possible diagram: If there exists any valid Venn diagram where the conclusion breaks, the conclusion does NOT follow. Must hold in ALL cases.

• AEIO Vowels: A = All (universal positive), E = No (universal negative — think E for Exclude), I = Some (particular positive — I see some), O = Some-not (particular negative — Oh, not all).
• ASnEBINOP: A distributes Subject, E distributes Both, I distributes Neither, O distributes Predicate. Read as A-S, E-B, I-N, O-P.
• Six Golden Rules shortcut — Two Negatives = No Output, Two Particulars = No Output. Remember: 2N = 0, 2P = 0.
• Complementary Pair = I and O siblings of the same family (same subject and predicate). When neither stands alone, they stand together.

• SSC CGL Tier 1 typically has 2-3 syllogism questions. They are usually straightforward two-statement problems with complementary pair traps added. Budget 45-60 seconds per question.
• Venn diagram method is recommended over formal rules for speed. Practice drawing the diagrams quickly — most questions are solvable in under a minute with good diagram practice.
• Recent SSC CGL papers (2022-2024) have increased the use of Either-Or conclusion questions. Always check for the I-O complementary pair before marking Neither follows.
• Be alert to questions with three statements — these appear occasionally in SSC CGL and require chaining conclusions step by step, treating the conclusion from the first two as a new premise.
• Negative conclusion trap: If one premise is negative (E or O type), the conclusion must be negative. If the question offers a positive conclusion in such cases, it is definitely wrong — eliminate it immediately to save time.