Figure Odd One Out – Revision Notes(≈1 350 words)
Target: JKSSB Social Forestry Worker – Basic Reasoning (Non‑Verbal)
1. What is “Figure Odd One Out”?
- A set of 3‑5 geometric figures (or pictures) is given.
- All figures share one or more common characteristics except one that differs in a specific way.
- Your task: identify the figure that does not belong to the group.
Key point: The odd figure may differ by shape, orientation, number of elements, shading, size, symmetry, or any logical rule that governs the rest.
2. Why it matters for the exam
- Tests observation, pattern‑recognition, and logical deduction – core skills for non‑verbal reasoning sections. – Usually 2‑4 questions appear in the reasoning paper; each correct answer adds +1 mark (no negative marking).
- Mastering the approach saves time: you can eliminate options quickly rather than trying every possibility.
3. General Step‑by‑Step Approach | Step | Action | What to look for |
| —— | ——– | —————— |
| 1 | Scan the whole set | Get an overall feel – are they all similar in shape? Are they arranged in a line/grid? |
| 2 | Identify the most obvious commonality | Start with the simplest attribute: number of sides, closed/open figures, presence of a dot, etc. |
| 3 | Test the rule on every figure | Does each figure obey the rule? Mark the one that violates it. |
| 4 | If more than one figure seems odd, look for a secondary rule | Sometimes two figures share a trait; the odd one out is the only one lacking both traits. |
| 5 | Confirm by elimination | Remove the odd figure and verify that the remaining figures truly share the identified property. |
| 6 | Mark answer | Choose the option that corresponds to the odd figure. |
Mnemonic to remember the steps: S‑I‑T‑E‑C → Scan, Identify, Test, Eliminate, Confirm.
4. Common Pattern Categories (with examples)
| Category | What to Check | Typical Variations | Example of Odd One Out |
|---|---|---|---|
| A. Shape / Geometry | Number of sides, type (triangle, square, circle), presence of curves | Regular vs. irregular polygons; open vs. closed | Four triangles + one square → square is odd |
| B. Orientation / Rotation | Direction the figure points; angle of rotation | 0°, 90°, 180°, 270°; mirror images | Three arrows pointing up, one pointing down → down‑arrow odd |
| C. Symmetry | Lines of symmetry, rotational symmetry | Vertical, horizontal, diagonal symmetry | Two figures symmetric about vertical axis, one asymmetric → asymmetric odd |
| C‑1. Mirror Image | Exact lateral inversion | Look for left‑right flipped versions | Four figures same orientation, one mirrored → mirrored odd |
| D. Count of Elements | Number of lines, dots, shapes inside the main figure | Dots, small squares, strokes | Three figures have 2 inner dots, one has 3 → 3‑dot figure odd |
| E. Shading / Fill | Solid, hollow, striped, dotted fill | Different patterns inside same outline | Four solid circles, one hollow → hollow odd |
| F. Size / Scale | Relative dimensions (big vs. small) | Same shape, different area | Four large squares, one tiny square → tiny odd |
| G. Position / Placement | Where a sub‑element lies (center, corner, edge) | Dot at top‑left vs. bottom‑right | Four figures with dot at centre, one with dot at corner → corner dot odd |
| H. Number of Intersections / Overlaps | How many times lines cross or shapes overlap | Count of crossing points | Three figures with 1 intersection, one with 2 → 2‑intersection odd |
| I. Pattern of Progression (Series) | In a row/column, figure changes stepwise (size ↑, rotation ↺, etc.) | Arithmetic or geometric progression in an attribute | In a line: circle → square → pentagon → hexagon → triangle (breaks side‑count increase) |
| J. Analogous Relationship (Matrix) | Figure A : Figure B :: Figure C : ? | Apply same transformation from A→B to C to find expected D; odd is the one that doesn’t match | A (triangle → square) adds one side; C (pentagon) → expected hexagon; if option shows heptagon → odd |
Tip: Start with the simplest categories (A‑D) before moving to relational patterns (I‑J). Most odd‑one‑out questions are solved by a single‑attribute rule.
5. Quick‑Reference Table of “Odd‑One‑Out” Clues | Clue | What to Ask Yourself | Typical Odd‑One‑Out |
| —— | ———————- | ——————– |
| Sides | Do all have same number of sides? | Different polygon |
| Angles | Are all angles equal (regular) or varied? | Irregular vs. regular |
| Orientation | Is there a common direction? | One rotated or flipped |
| Symmetry | Does each have a line/rotational symmetry? | Asymmetric figure |
| Inner Dots/Shapes | Count of inner marks equal? | Different count |
| Shading | Same fill pattern? | Hollow vs. solid |
| Size | Same area/perimeter? | One noticeably larger/smaller |
| Position of Mark | Mark always in same quadrant? | Mark in a different quadrant |
| Intersections | Same number of line crossings? | Different crossing count |
| Progression | Does size/shade/number change step‑wise? | Break in the step |
6. Mnemonics for Pattern Spotting
| Mnemonic | Meaning | When to Use |
|---|---|---|
| R‑C‑P‑S‑S | Rotation, Colour/Shading, Position, Size, Shape | First‑pass checklist for any set |
| 2‑4‑6‑8 | 2 lines, 4 corners, 6 angles, 8 symmetry checks (useful for complex polygons) | When figures are multi‑sided |
| MIRROR | Mirror, Inner count, Rotation, Regularity, Outline, Repeat | Detect mirror‑image odd ones |
| GRID | Group (same family), Repeat (pattern), Increment/decrement, Difference (odd) | For matrix/grid layouts |
| ABCD | Angle, Boundary (sides), Colour, Dimension | Quick scan for basic attributes |
How to apply: Silently run through the letters; the first attribute that fails for a figure flags it as a candidate odd one.
7. Strategies to Avoid Common Traps
| Trap | Why it happens | How to avoid |
|---|---|---|
| Over‑looking simple attributes | Test‑takers jump to complex rotations and miss a plain side‑count difference. | Always start with Shape → Sides → Closed/Open before orientation. |
| Being misled by superficial similarity | Two figures may look alike (same outer shape) but differ in inner pattern. | Check inner elements (dots, lines) after confirming outer shape. |
| Assuming symmetry when none exists | Human brain prefers symmetry; may invent a line that isn’t there. | Physically (or mentally) draw a line; if halves don’t match, symmetry is absent. |
| Confusing rotation with reflection | A 180° rotation can look like a mirror for some shapes (e.g., letters N, S). | Test both: rotate the figure in your mind; if it matches another, it’s rotation, not reflection. |
| Missing a “progression break” | In a series, the change may be subtle (size increases by 1 mm each step). | Measure relative change: compare first‑second, second‑third, etc.; look for a constant step. |
| Choosing the figure that looks “weird” instead of the one that breaks the rule | Visual oddness can distract. | Verify that the remaining figures truly share a rule; if not, re‑evaluate. |
| Time pressure leading to guesswork | Spending too long on one set. | Use the S‑I‑T‑E‑C routine; if after 30 seconds no rule is clear, move on and return later if time permits. |
8. Practice Drill – How to Study Effectively
- Collect 20‑30 odd‑one‑out questions from previous JKSSB/SSC reasoning papers or standard non‑verbal books.
- Solve each set under timed conditions (45 seconds per set).
- After each attempt, write down:
- The rule you identified (or why you failed).
- Which mnemonic helped.
- Any trap you fell into.
- Create a personal “cheat‑sheet” of the most frequent rules you observed (e.g., “inner dot count varies”, “rotation by 90°”). 5. Review the cheat‑sheet before the exam; it becomes a quick reference.
9. Sample Questions with Solutions
Question 1
Four figures are shown:
A) a solid triangle
B) a hollow triangle
C) a solid square
D) a hollow square
Odd one out?
Solution:
- Apply R‑C‑P‑S‑S:
- Rotation: all same (0°). – Colour/Shading: A & C are solid; B & D are hollow → two groups.
- Position: all centred.
- Size: all appear same.
- Shape: A & B are triangles; C & D are squares → two groups.
We need a single figure that breaks a rule common to the other three.
Notice that three figures are solid (A, C, ???) Actually only A and C are solid; B and D are hollow → not three.
Look at shape: three are triangles? No, only A and B are triangles.
Now examine number of sides: triangle (3 sides) vs. square (4 sides). Two triangles, two squares.
But observe shading + shape combination: – A: solid triangle
- B: hollow triangle
- C: solid square
- D: hollow square
If we pair solid with triangle (A) and hollow with square (D) we get a pattern: solid ↔ triangle, hollow ↔ square.
Check B (hollow triangle) breaks the pattern (should be solid triangle).
Check C (solid square) also breaks (should be hollow square). Thus there are two patterns; the odd one is the figure that does not share either of the two consistent pairings.
Pick the figure that appears only once in its shading‑shape combination:
- Solid triangle: appears once (A)
- Hollow triangle: appears once (B)
- Solid square: appears once (C)
- Hollow square: appears once (D)
All appear once – need another angle.
Better approach: Count of solid figures = 2 (A, C). Count of hollow figures = 2 (B, D). No help. Look at number of vertices: triangle (3), square (4). Two each.
Now consider orientation: none rotated.
The only attribute that yields three alike and one different is whether the figure is a triangle or a square if we consider shading as secondary: – Among solids: A (triangle) and C (square) → different.
- Among hollows: B (triangle) and D (square) → different.
Thus no three alike.
Hence the question may be ambiguous; however, typical exam expects odd one out = the figure that is the only one with a curved side – but none have curves.
Let’s replace with a clearer example.
Revised Question 1 (clear)
Figures:
A) solid triangle
B) solid triangle
C) hollow triangle
D) solid square
Odd one out?
Solution: – Shape: three triangles (A, B, C) vs. one square (D) → D differs by shape.
- Shading: among triangles, two solid (A, B) and one hollow (C) – not consistent across all.
Thus the rule “all figures are triangles” holds for A, B, C; D breaks it.
Answer: D (solid square).
Question 2
A set of five figures arranged in a row:
1) ▢ with a dot at top‑left
2) ▢ with a dot at top‑right
3) ▢ with a dot at bottom‑left
4) ▢ with a dot at bottom‑right
5) ▢ with a dot at centre
Odd one out?
Solution:
- All are squares (same shape, size, shading). – Position of the dot varies.
- Four dots are at a corner; one dot is at the centre. Thus the rule “dot is located at a corner” holds for figures 1‑4; figure 5 breaks it.
Answer: Figure 5.
Question 3
Four figures:
A) Pentagon with one internal line (diagonal)
B) Pentagon with two internal lines (forming an X)
C) Pentagon with three internal lines (forming a star)
D) Hexagon with one internal line
Odd one out?
Solution:
- Examine number of sides: A, B, C are pentagons (5 sides); D is a hexagon (6 sides) → D differs by shape.
- Check if any other rule yields three alike: number of internal lines varies (1,2,3,1) – not constant.
Thus the simplest rule is “all figures are pentagons”.
Answer: D (hexagon).
Question 4
Matrix (2×2):
Top‑left: → (arrow pointing right)
Top‑right: ↓ (arrow pointing down) Bottom‑left: ← (arrow pointing left)
Bottom‑right: ?
Odd one out? (choose from options)
Options:
① ↑ (arrow up)
② ↘ (diagonal down‑right)
③ ↺ (circular arrow)
④ → (arrow right)
Solution:
Observe a rotation pattern clockwise:
- Top‑left (→) rotated 90° clockwise gives Bottom‑left (←)?? Actually → rotated 90° CW = ↓ (top‑right).
- ↓ rotated 90° CW = ← (bottom‑left).
- ← rotated 90° CW = ↑ (should be bottom‑right).
Thus the missing figure should be ↑ (arrow up).
Now check the options: ① matches ↑. The other options do not follow the rotation rule.
Answer: ①.
Question 5
Four figures:
A) Circle with three equally spaced radii (like a Mercedes logo)
B) Circle with two radii opposite each other
C) Circle with one radius
D) Circle with no radius (plain circle)
Odd one out?
Solution:
- All are circles (same shape, size, shading).
- Attribute: number of radii.
- A: 3, B: 2, C: 1, D: 0. The sequence decreases by 1 each step.
If we consider the rule “number of radii is an odd number”, then A (3) and C (1) fit, B (2) and D (0) do not.
If we consider “number of radii is even”, then B and D fit.
Neither yields three alike.
Look at symmetry:
- A has 3‑fold rotational symmetry (order 3).
- B has 2‑fold symmetry (order 2). – C has 1‑fold (no symmetry).
- D has infinite symmetry (circle).
Again no clear three‑alike.
But notice that figures A, B, C all have at least one radius, while D has none. Thus the rule “figure contains at least one radius” holds for A, B, C; D breaks it.
Answer: D (plain circle).
10. Final Revision Checklist (to run through just before the exam)
- [ ] S‑I‑T‑E‑C routine applied?
- [ ] Checked shape & number of sides first?
- [ ] Looked at shading / fill next?
- [ ] Verified orientation / rotation?
- [ ] Counted inner elements (dots, lines, stars)?
- [ ] Noted size differences (big vs. small)? – [ ] Examined position of any marks (corner, centre, edge)?
- [ ] Considered symmetry (mirror, rotational)?
- [ ] Looked for simple progression (size ↑, count ↓, etc.)?
- [ ] If still unclear, tested rotation vs. reflection?
- [ ] Applied relevant mnemonic (R‑C‑P‑S‑S, MIRROR, GRID).
- [ ] Eliminated options that definitely share the rule; the leftover is answer.
11. Quick Memory Aid – “ODD ONE” | Letter | Prompt | What to do |
| ——– | ——– | ———— |
| O | Outline – shape, sides, open/closed | Identify basic geometry |
| D | Dots / inner marks – count & position | Look for inner elements |
| D | Direction – orientation, rotation, mirror | Note arrows, flips |
| O | Outfill – shading, solid/hollow/pattern | Observe fill style |
| N | Number – size, quantity, progression | Check relative size or numeric change |
| E | End‑point – symmetry, intersections, special features | Look for symmetry lines, crossing points |
| (space) | Sum up – does the rule apply to all but one? | Confirm odd figure |
Say “ODD ONE” silently while scanning the set; each letter reminds you of a category to test.
12. Closing Thought
Mastering Figure Odd One Out is less about memorising countless patterns and more about training your eyes to spot the rule that governs the majority. By consistently applying the S‑I‑T‑E‑C routine, using the mnemonics, and practicing with timed sets, you’ll turn what often feels like a guessing game into a quick, reliable scoring opportunity in the JKSSB Social Forestry Worker Reasoning paper.
Good luck, and remember: the odd one is usually the simplest deviation – trust your first, systematic observation!
