Logical Reasoning: Structure Beats Speed
What to master
Logical Reasoning in MBA CET is mostly arrangement puzzles, syllogisms, blood relations, direction sense, coding–decoding, series and critical reasoning (assumptions, conclusions, cause–effect, strong/weak arguments). Build notation first: a family tree with +/− for male/female and horizontal/vertical lines for sibling/parent; a compass sketch for direction questions; Venn diagrams for syllogisms.
Traps that cost marks
- Facing direction in seating puzzles. In a circle facing the centre, "third to the left" moves anticlockwise; facing outward it moves clockwise. Fix this before you draw.
- Syllogisms with "some" and "no". A conclusion is valid only if it holds in every diagram consistent with the statements. "Some A are B" and "Some B are C" tells you nothing about A and C.
- Either–or pairs. "Some A are B" / "No A is B" is either–or only when each is individually undecidable but one must follow.
- Critical reasoning extremes. Options with all, never, only are usually wrong, as is anything needing outside knowledge.
- Inverted stems. "Which does NOT follow" is a favourite.
Rule of thumb
For syllogisms, test the negation of each conclusion: if the negation is compatible with the statements, the conclusion fails.
Worked example
Statements: All pens are books. No book is a chair. Draw books as a circle containing pens, chairs entirely outside books. Pens can never touch chairs, so "No pen is a chair" is valid. But "Some books are not pens" is not definite - pens could equal books. That is exactly the trap examiners set.