21 Rules of Syllogism 🔥 | Syllogism Reasoning for Bank Exam | Basic to Advanced | by Sachin Sir

Main ideas / concepts taught

• Syllogism basics and exam framing (Bank/SSC)

  • Syllogism questions are presented as Statements + Conclusions in verbal form.
  • You must understand what the statements mean, then determine whether each conclusion is:
    • definitely true, or
    • possibly true
  • Finally, select the correct option based on that classification.

• “21-rule” approach (focus on early-to-mid foundational rules, especially rules 1–15)

  • The speaker emphasizes that using these rules consistently (and not mixing methods) leads to 100% accuracy.

---

Methodology / instruction set (as presented)

How to study (watching strategy)

• If you’re new to syllogism

  • Watch the entire lecture from start to end (beginner-friendly path).

• If you’ve studied syllogism before

  • Follow the teacher’s method fully; don’t mix concepts from other sources.

• Pace control

  • If the session feels slow, use 1.25x / 1.5x / 1.75x / 2x playback speed.

• Timestamp practice system

  • After each concept, check the corresponding timestamps and revise later by revisiting those points.

• Revision

  • The teacher recommends revising after finishing each concept.
  • Revision within a week is acceptable.

---

Core syllogism principles taught (early rules)

Rule 1: Question/statement-conclusion framing

• Questions follow the pattern: Statements (premises) → Conclusions (to verify)

• Choose options based on whether conclusions follow from the statements.

Rule 2: Statements are definite; conclusions are definite or possible

• Statements are written in definite language.
• Conclusions must be interpreted as either:
  • Definite conclusion (certain), or
  • Possible conclusion (may happen)

Rule 3: Golden Rule of Syllogism

• If you don’t know the relationship between two parts in the Venn diagram, then you can arrange them flexibly:
  • separate
  • partially overlap
  • or one can be fully inside the other
• This flexibility supports handling uncertain regions.

---

Handling statement types using Venn diagrams

Four basic “types of statements” mentioned

The speaker groups basic categorical forms into four:

• All A are B
• Some A are B
• Some A are not B
• No A is B

These are represented using Venn diagrams (circles/regions; exact diagram shape may vary, but meaning must match).

---

Definite vs possible conclusions: main testing approach

Difference between definite and possible

• Possible conclusion testing

  • Check whether the conclusion can be true in at least one valid arrangement.
  • “Possible” means it can be made consistent with the statements.

• Definite conclusion testing

  • A definite conclusion must be validated by showing the arrangement cannot avoid it.
  • i.e., it must hold in all valid arrangements.

The “two-task” idea for definite conclusions (summarized later)

For definite conclusions, you must:

1. Correctly decide whether the conclusion is definite vs possible.
2. Apply the correct definite logic using the definite rules.

---

Possibility-check tools and “tricks” (used repeatedly)

Definite/possible conversion examples

The teacher repeatedly maps forms like:

• All A are B → definite
• All A can be B / may be B / might be B → possible

(Similar conversions are provided for “Some …” and “No …” forms.)

Key method for checking possible “No”

When the conclusion says something is not possible (“No …”), the instruction is:

• Check the possibility of the complementary “Some …” form (the paired opposite/sum pairing),
• then decide the “no” based on that.

“Even vs No” relationship (possibility pairing idea)

• In possibility checking:
  • If “some …” is possible, then “no …” is ruled accordingly (and vice versa).
• The rule is framed as: “possibility of none” follows the same logic as the complementary “some” possibility check.

“Virat Kohli concept” (definitely-true inference handling)

A special concept is used to reject reasoning that treats definitely true information as merely possible.

• Core message: If information is 100% true, then the “possibility of the contradictory” must be treated as wrong.

• Used to decide when “Definitely true” cannot simultaneously be treated as “possible”.

---

Complementary pairs (Rule 13 and discussion)

Definition

A complementary pair consists of two statements where:

• If one is correct, the other must be wrong
• If the other is correct, then the first is wrong

Specific complementary pairs emphasized

• even (possible some) ↔ no
• The speaker stresses that in a valid scenario, they cannot both be correct together.

---

Definite Conclusion rules (Rule 15 emphasized strongly)

Rule 15 (as taught near the end)

For a definite conclusion:

• If the drawn Venn diagram itself makes the conclusion look inconsistent/wrong, then:
  • the definite conclusion must be wrong

In practice:

• The teacher checks whether the region required by the definite conclusion is:
  • missing, or
  • contradicted in the diagram.

Contrast: Possibility checking allows flexibility (only one arrangement needs to work), while definite conclusions require ruling out alternatives.

---

Practical exam guidance embedded throughout

• Solve yourself first, then watch the discussion.
• If your answer conflicts with the teacher’s:
  • don’t guess blindly—revisit the step where you applied possibility vs definite logic.
• Use the Venn diagram consistently:
  • apply the golden rule for unknown relationships,
  • apply definite logic to reject contradictions.

---

Speakers / sources featured

• Sachin Sir (main instructor; references like “Sachin Sir Banking” and Telegram handwritten notes)
• Sumit Sir (mentioned for conceptual comparison around “possibility of some vs no” logic)
• Virat Kohli (referenced in the “Virat Kohli concept”)
• Newton (Newton Baba) (referenced via an analogy about formula/experimentation)
• Schrödinger / Schrodinger (referenced via “Doctor Strange Multiverse Madness / Schrödinger cat” style analogy)
• Doctor Strange (multiverse/universe analogy)
• Telegram channel (source for “handwritten notes” and PDFs; described as part of the teacher’s process)