Reasoning and Military Aptitude: Pattern Discipline
What the section tests
This section blends standard reasoning - series (number, letter, figure), analogies, classification, coding-decoding, blood relations, direction sense, syllogism, seating arrangement, ranking, clocks and calendars - with military aptitude items testing spatial visualisation, orientation, map sense and quick pattern recognition.
Concepts to master
- Series logic: differences, second differences, alternating series, squares and cubes, prime jumps.
- Coding-decoding: positional shifts, reversal, letter-to-number mapping.
- Direction sense: draw a rough compass sketch every time; track facing direction separately from movement direction.
- Blood relations: build a family tree with gender markers; never solve in your head.
- Syllogism: use Venn diagrams; a conclusion is valid only if true in every possible diagram.
- Ranking: total = rank from left + rank from right − 1.
Traps to watch
- Series that change rule midway (add, then multiply).
- Direction questions where the person turns before walking - turning changes facing, not position.
- "Either/or" syllogism conclusions that need a complementary pair.
- Spatial items where rotation and reflection give mirror-image options; check chirality, not just shape.
Worked example
In a row, A is 12th from the left and 18th from the right. Total people? Total = 12 + 18 − 1 = 29. The subtraction of 1 corrects the double-counting of A. Rule of thumb: for any counting puzzle, sketch and mark positions rather than reasoning verbally.