Reasoning Ability: Structure First, Guesswork Last
Reasoning Ability tests how you extract structure from puzzles and verbal logic: seating arrangements, syllogisms, inequalities, coding-decoding, blood relations, series, and data sufficiency. The exam rewards a repeatable method because one wrong assumption can invalidate an entire puzzle set.
Build a compact representation
- For linear or circular seating, fix one person or one end, place definite clues first, and mark negative clues with a cross.
- For syllogisms, draw the minimum Venn diagram and test each conclusion; a conclusion follows only if it is true in every diagram compatible with the statements.
- For inequalities, reduce the clues to a single chain such as A > B ≥ C, then test the asked relation.
- For coding, compare two coded words with shared letters to isolate letter shifts.
Worked example
Statements: All pens are inks. Some inks are bottles. Conclusion 1: Some pens are bottles. Conclusion 2: Some bottles are inks. From “Some inks are bottles,” conversion gives “Some bottles are inks,” so conclusion 2 follows. Conclusion 1 does not: the bottles that are inks may lie outside the pens set. The minimum diagram has pens inside inks, with bottles overlapping inks but not necessarily pens.
Traps that cost marks
Do not convert “All A are B” into “All B are A.” Do not read “some” as “some but not all” unless the statement says so. In puzzles, avoid assuming a person’s position from a clue that only says “not adjacent.” In data sufficiency, stop when the question is answerable and do not import extra data.