Reasoning and Mental Ability
Reasoning and Mental Ability tests pattern recognition and logical deduction rather than advanced mathematics. The common areas are number and letter series, coding–decoding, blood relations, directions, syllogisms, analogies, seating arrangement and classification.
Core approaches
- Number series: check differences, squares/cubes, alternating operations and prime patterns.
- Coding: map letters by position (A=1 … Z=26); check reversal, shifts and letter-pair rules.
- Blood relations: draw a family tree; mark gender only when the question defines it.
- Directions: fix north at the top; track left/right turns from the person’s facing direction.
- Syllogism: use Venn diagrams; “all A are B” does not imply “all B are A.”
- Analogy: identify the relationship (part–whole, cause–effect, synonym) before choosing.
Worked example
Question: “If CAT is coded as DBU, how is DOG coded?” Each letter moves one step forward: C→D, A→B, T→U. Apply the same shift: D→E, O→P, G→H. Answer: EPH.
Traps
- Assuming the converse of “all” statements.
- Forgetting that left/right depends on facing direction.
- Missing an alternating series rule.
- Treating “some” as “all”.
- Overlooking letter position when the shift is not uniform.