Odd one out
14 free practice questions with explanations
PassNova has 14 free Logical & Abstract Reasoning practice questions on Odd one out, each with a clear explanation. Practise them in the browser with instant feedback — 100% free, no sign-up, on any device. Updated for 2026.
Odd one out: example questions & answers
12 worked examples with answers and explanations below. Practise all 14 Odd one out questions free in the browser, with instant feedback on every answer.
Which is the odd one out: 3, 5, 9, 11, 17?
- A3
- B5
- C9✓
- D17
Answer: All the numbers are prime except 9, which equals 3 x 3, so 9 is the odd one out.
Which is the odd one out: 2, 4, 6, 9, 10?
- A2
- B6
- C9✓
- D10
Answer: All the numbers are even except 9, which is odd, so 9 is the odd one out.
Which is the odd one out: Apple, Banana, Carrot, Orange?
- AApple
- BBanana
- CCarrot✓
- DOrange
Answer: Apple, banana and orange are fruits, while a carrot is a vegetable, so carrot is the odd one out.
Which is the odd one out: Square, Triangle, Circle, Rectangle?
- ASquare
- BTriangle
- CCircle✓
- DRectangle
Answer: A square, triangle and rectangle all have straight sides and corners, while a circle has none, so circle is the odd one out.
Which is the odd one out: 16, 25, 36, 40, 49?
- A16
- B25
- C40✓
- D49
Answer: 16, 25, 36 and 49 are perfect squares, but 40 is not, so 40 is the odd one out.
Which is the odd one out: Dog, Cat, Sparrow, Horse?
- ADog
- BCat
- CSparrow✓
- DHorse
Answer: A dog, cat and horse are four-legged mammals, while a sparrow is a two-legged bird, so sparrow is the odd one out.
Which is the odd one out: 8, 27, 64, 100, 125?
- A8
- B64
- C100✓
- D125
Answer: 8, 27, 64 and 125 are cube numbers, but 100 is a square not a cube, so 100 is the odd one out.
Which is the odd one out: Red, Blue, Loud, Green?
- ARed
- BBlue
- CLoud✓
- DGreen
Answer: Red, blue and green are colours, while loud describes sound, so loud is the odd one out.
Which is the odd one out: 21, 33, 37, 39?
- A21
- B33
- C37✓
- D39
Answer: 21, 33 and 39 are all divisible by 3, but 37 is prime, so 37 is the odd one out.
Which is the odd one out: January, March, June, July?
- AJanuary
- BMarch
- CJune✓
- DJuly
Answer: January, March and July all have 31 days, while June has 30, so June is the odd one out.
Which is the odd one out: Copper, Iron, Plastic, Gold?
- ACopper
- BIron
- CPlastic✓
- DGold
Answer: Copper, iron and gold are metals, while plastic is not, so plastic is the odd one out.
Which word is the odd one out: BAT, CAT, RAT, DOG?
- ABAT
- BCAT
- CRAT
- DDOG✓
Answer: BAT, CAT and RAT all end in 'AT', while DOG does not, so DOG is the odd one out.