Reasoning
Reasoning in the IBPS RRB Treasury Manager paper is a 40-question, speed-plus-accuracy section: puzzles and seating, syllogism, inequality, coding-decoding, blood relations, direction sense, series and data sufficiency. No calculator is allowed, and negative marking makes speculative guessing costly.
Core rules
- Syllogism: draw the minimum Venn diagram satisfying every statement. A conclusion follows only if it is true in every possible diagram. "Only a few A are B" means some A are B and some A are not B; "some A are not B" does not imply "some A are B".
- Inequality: build one chain and combine only when the same variable links both parts. "Either-or" applies to a complementary pair on the same subject-predicate (for example A ≤ B and A > B) when neither alone is definite.
- Puzzles: place definite clues first (fixed numbers, end seats, floors), then mark relative clues. Keep two possible grids until a clue eliminates one.
- Coding: convert letters using A=1 to Z=26, then check reversal, shifts and position sums.
Worked example
Statements: All vaults are lockers. Some lockers are keys. Conclusions: I. Some vaults are keys. II. Some keys are lockers. Draw vaults inside lockers, with lockers overlapping keys. The overlap can avoid vaults, so I is not forced. "Some lockers are keys" converts to "some keys are lockers", so II follows. Answer: only II follows.
Traps
Converting "All A are B" into "All B are A"; reading "some" as "only some"; ignoring the either-or condition in inequality; fixing one seating arrangement before testing alternatives; treating "brother of mother" as paternal uncle.
Treat each puzzle as a constraint-satisfaction exercise: count the entities, list the attributes, and fill only what is forced.