PERA CET: Logical Reasoning and Analytical Ability

Domain overview

PERA CET Logical Reasoning and Analytical Ability tests structured thinking rather than memorised facts: syllogisms, seating and ranking arrangements, blood relations, coding-decoding, series, puzzles, and data sufficiency.

Core rules

• Syllogism: draw minimal Venn diagrams. 'All A are B' does not imply 'All B are A.' 'Some A are B' converts to 'Some B are A'; 'No A is B' converts to 'No B is A.'
• Arrangements: fix extreme positions and definite clues first; mark facing direction (north/south) because left and right reverse when facing south.
• Blood relations: draw a family tree with gender symbols; do not assume gender from a name or role.
• Coding-decoding: check letter positions and shifts before assuming word patterns.
• Data sufficiency: decide whether the data is enough; do not solve fully unless needed.

Worked example

Statements: All pens are books. Some books are red. Conclusions: (I) Some pens are red. (II) Some red are books. Only II follows. 'Some books are red' converts directly to 'Some red are books.' The pens could all be non-red books, so I is not forced.

Traps

Treating 'some' as 'some but not all'; converting 'All A are B' into 'All B are A'; ignoring 'either/or' conclusions; missing a second arrangement that satisfies all clues; and in puzzles, assuming a unique solution before checking alternatives.