Example 1 · level 1
Find the odd one out: 87, 83, 71, 13
- 87
- 83
- 71
- 13
Show solution
- 83, 13, 71 are prime numbers.
- 87 is not, so it is the odd one out.
Answer: 87
SSC & BANK EXAMS: REASONING · CLASSIFICATION
Odd one out (numbers)
Test common properties one by one: prime, perfect square, perfect cube, multiple of 7/11/13, same digit sum.
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Worked examples
Example 2 · level 2
Find the odd one out: 97, 39, 29, 37
- 97
- 39
- 29
- 37
Show solution
- 97, 29, 37 are prime numbers.
- 39 is not, so it is the odd one out.
Answer: 39
Example 3 · level 3
Find the odd one out: 8, 728, 64, 512
- 8
- 728
- 64
- 512
Show solution
- 512, 64, 8 are perfect cubes.
- 728 is not, so it is the odd one out.
Answer: 728