Reasoning and Mental Ability: Pattern Recognition Under Time Limit
This section tests logical structure rather than computation: series completion, analogies, coding–decoding, blood relations, direction sense, syllogism, seating and ranking, clocks and calendars, plus non-verbal items on mirror images, embedded figures and paper folding. The scoring logic is deterministic, so a correct method gives a certain answer.
Methods that work
- Series: check first differences, then second differences; test squares, cubes and their ±1 variants; for letter series convert letters to positions 1–26.
- Syllogism: draw minimal Venn diagrams, then test conclusions for both necessity and possibility. 'Some A are B' is reversible; 'All A are B' is not.
- Blood relations: draw a family tree, using + for male and − for female, and never assign gender from a relationship word alone.
- Direction sense: fix north at the top, track net displacement using Pythagoras for right-angled turns.
- Ranking: total = position from left + position from right − 1.
Worked example
Statements: All clerks are officers. Some officers are auditors. Conclusion: Some clerks are auditors. Reasoning: the auditors who are officers may lie entirely outside the clerk set; the premises do not force any overlap. The conclusion is only possible, not definite, so in a standard 'which conclusion follows' item it does not follow.
Traps that cost marks
- Treating a possibility as a certainty in syllogism.
- Assuming gender from words like 'cousin' or 'child'.
- Forgetting that a left turn after facing south points east, not west - reorient each time.
- In calendars, miscounting odd days when the reference year is a leap year.
- In coding, applying the shift to the wrong letter position (first versus last).