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TCS NQT GuideTCS NQT Reasoning AbilitySyllogism: Venn Diagram Method & Rules

Syllogism: Venn Diagram Method & Rules

Learn core concepts, essential formulas, and attempt practice questions designed on the latest TCS NQT testing patterns.

Key Concepts & Formulas

  • 1All A are B: A circle is completely inside B circle.
  • 2Some A are B: A circle overlaps with B circle.
  • 3No A is B: A and B circles are completely separate.

TCS NQT Style Practice Questions

Practice Question 1

Statements: All cats are dogs. All dogs are animals. Conclusions: (I) All cats are animals. (II) Some animals are cats.

A) Both I and II follow
B) Only I follows
C) Only II follows
D) Neither follows

Correct Answer: A) Both I and II follow

Step-by-step Solution: Venn diagram: Cats circle inside Dogs, which is inside Animals. Since Cats is inside Animals, All cats are animals (I follows). Since Cats is inside Animals, some part of Animals is Cats (II follows).

Practice Question 2

Statements: Some pens are books. No book is a copy. Conclusion: (I) Some pens are copies. (II) No pen is a copy.

A) Either I or II follows
B) Both follow
C) Only I follows
D) Only II follows

Correct Answer: A) Either I or II follows

Step-by-step Solution: Since copy can overlap with pens in one possibility and not overlap in another, either it overlaps or it doesn't. This creates an either-or case.

Study Pro-Tip

Always draw the minimum overlap scenario first, then check possible exception diagrams.

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