Odd One Out for CUET UG

Word-based questions present four or five words where three or four share a common category and one does not. The hidden link is almost always a semantic category — colour, planet, body part, fruit, sense organ, metal, and so on.

Watch for double-category traps: sometimes two different groupings look valid at first glance. Always try to find the grouping that accounts for the largest number of items.

Common CUET categories: colours (red, blue, green — violet is also a colour but could be a flower), planets (Mercury, Venus, Earth — Moon is not a planet), sense organs (eye, ear, nose — skin is also a sense organ, tongue may not feel obvious), and musical instruments (sitar, tabla, veena — harmonium uses air while others use strings).

Each option is a group of three or four letters. The task is to find the group that does not follow the same internal pattern as the others.

Four patterns to check in order:

1. Position sequence: letters at positions 1, 3, 5 → odd gaps mean odd one out.
2. Skip pattern: A, C, E skips one each time. B, E, H skips two each time.
3. Reversal: ACE reversed is ECA. Some groups are mirror reversals of each other.
4. Opposite pair: A↔Z, B↔Y, C↔X. If three groups pair letters by their opposites and one does not, that group is odd.

Number the positions and subtract to find gaps. Equal gaps = same pattern. Unequal gap = potential odd one.

Three or four numbers share a mathematical property. One number violates it. The most common properties tested in CUET are:

• Perfect squares: 4, 9, 16, 25, 36, 49, 64, 81, 100 …
• Perfect cubes: 8, 27, 64, 125, 216 …
• Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 …
• Multiples of a common base: 12, 18, 24, 30 are all multiples of 6 — if 14 is added, 14 is odd.
• Digit sum property: digit sum divisible by 3, 9, etc.
• Even/odd mix: three evens and one odd or vice versa.

If none of those work, look at the number of digits, place value patterns, or whether numbers are consecutive with one gap that does not fit.

In pair-based questions each option is a colon-separated pair such as Dog : Bark or Pen : Write. Three pairs share the same type of relationship and one does not.

Relationship types to recognise:

• Category – member: Fruit : Mango, Furniture : Chair.
• Tool – function: Pen : Write, Knife : Cut.
• Animal – sound: Dog : Bark, Cat : Meow.
• Animal – young: Cow : Calf, Horse : Foal.
• Synonym pair: Happy : Joyful, Sad : Sorrowful.
• Antonym pair: Hot : Cold, Fast : Slow.
• Product – raw material: Bread : Wheat, Paper : Wood.

Always check direction consistency, not just the content of each pair.

Four or five figures are given. Three share a visual property and one does not. The tested properties are:

• Number of sides or elements: three triangles and one quadrilateral.
• Symmetry: three figures have a line of symmetry and one does not.
• Shading pattern: three have the inner shape shaded, one has the outer shape shaded.
• Orientation/rotation: three are rotated by 90° increments, one is flipped (mirror image).
• Size relationship: inner shape is half of outer in three figures, not in the fourth.
• Pattern count: three figures have an odd number of dots or lines, one has an even number.

In CUET paper-based sets, this type may appear as described figures (shape names with properties written out) rather than actual images.

Odd one out can always be solved by elimination: try to place three options into a common group and see which item is left out. The leftover is the odd one.

This method prevents the common mistake of isolating the odd option first. Instead, prove the group of three before naming the odd.

When two groupings seem equally valid (for example, three vowels or three animals that are also pets), the better grouping is the one that accounts for the most specific shared property across the majority options.

CUET setters often create questions where two interpretations appear valid. Learning to spot these traps is the difference between 90th and 99th percentile scores in this chapter.

Common traps:

• A word belongs to two categories and only one of those categories makes it odd.
• A letter group looks like a skip-2 pattern but is actually a positional-sum pattern.
• A number is both prime and odd — the tested property is prime, not odd.
• A pair has the right words but the wrong relationship direction.

One and only one option should fail the rule. If two options fail, revise the rule.

Odd one out is one of the fastest scoring chapters in CUET logical reasoning if approached with a checklist habit. There are only five question types and each has a fixed scan sequence.

Priority order during paper:

1. Attempt word-based and number-based first — fastest.
2. Attempt pair-based next.
3. Attempt letter group — requires writing alphabet positions.
4. Attempt figure-based last — requires the most steps.

If you are stuck after 40 seconds, use the elimination method and move on. Do not lose two easy questions hunting for a perfect explanation on one hard question.