Logical Reasoning: constraint puzzles under a clock
Logical Reasoning on IPMAT Rohtak is puzzle-led: multi-constraint seating arrangements and distribution/grouping sets, plus shorter standalone items on blood relations, direction sense, ranking, syllogisms, coding–decoding, series, calendars and data sufficiency.
A method that survives time pressure
- Draw the frame before re-reading clues: a numbered row, a circle with left and right marked, or a grid of categories.
- Label each clue as fixed ("R is third from the left"), relative ("Q is immediately right of P") or negative ("S is not next to Q"). Place fixed clues first, negatives last.
- Facing north, a person's left is your left; facing south, it mirrors. Write the mirror rule on your rough sheet once per set.
- In grouping puzzles, note how many items each slot can hold before assigning names.
- Syllogisms: "All A are B" does not convert; "Some A are B" does. "No A is B" is symmetric.
Worked example
P, Q, R and S occupy a row of four seats facing north. Q is not at either end. R sits immediately to the right of Q. S is not adjacent to Q. P sits at an end. Who is in seat 3? Q must be in seat 2 or 3. If Q were in 3, then R = 4, S (not adjacent to Q) = 1 and P = 2 - contradicting "P sits at an end". So Q = 2, R = 3, P = 1 and S = 4. R is in seat 3.
Traps
- Reading "second to the left" as "immediately left".
- Forgetting that "not adjacent" excludes two seats, not one.
- Assuming a single arrangement survives: many items ask "which must be true", so test each option against every surviving case.
- In data sufficiency, fully solving instead of checking whether each statement alone is sufficient.