Reasoning, Analytical and Mental Ability: Series, Logic and Arrangement
What the reasoning paper tests
KPTCL reasoning questions cover number and letter series, coding-decoding, blood relations, direction sense, syllogism, seating arrangement, clocks and calendars. The paper tests valid deduction under stated conditions, not real-world assumptions.
Core rules
- Series: check differences, then second differences; for letters, convert to positions A=1 to Z=26.
- Coding: identify the shift pattern separately for each letter position.
- Syllogism: draw minimal Venn diagrams; a conclusion is valid only if it must be true in every diagram satisfying the premises.
- Seating: fix one definite position, then place relative clues; use “left/right” from the facing direction.
- Clock: angle=|30H−5.5M|; calendar: ordinary year shifts 1 odd day, leap year 2.
Worked example
Find the next term: 2, 6, 12, 20, 30. Differences are 4, 6, 8, 10; the next difference is 12, so the next term is 30+12=42. Alternatively, terms are n(n+1): 1×2, 2×3, 3×4, 4×5, 5×6, so the next is 6×7=42.
Traps
Treating a “possibility” conclusion as definitely true; reversing left/right for people facing south; using the converse of a valid statement; and forgetting that “some A are B” does not imply “some B are A” unless the diagram forces it.