Q1. Find the odd one out.
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Answer: D. 25
25 is the odd one out. All others are prime numbers.
Classification Questions for SSC CGL (with Answers)
63 Classification MCQs from the General Intelligence & Reasoning section, with answers and short explanations.
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Q2. Find the odd one out: 61, 63, 67, 89
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Answer: A. 63
All except 63 are prime numbers; 63 is composite.
Q3. Find the odd one out: 42, 48, 78, 81
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Answer: A. 81
All except 81 are multiples of 6.
Q4. Find the odd one out: 144, 255, 256, 324
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Answer: C. 255
All except 255 are perfect squares.
Q5. Find the odd one out: 18, 30, 72, 73
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Answer: D. 73
All except 73 are multiples of 6.
Q6. Find the odd one out: DFI, FHJ, OQS, UWY
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Answer: B. DFI
In all groups except DFI, consecutive letters are 2 apart. In DFI the second gap is 3.
Q7. Find the odd one out: FIL, ILO, ORV, SVY
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Answer: C. ORV
In all groups except ORV, consecutive letters are 3 apart. In ORV the second gap is 4.
Q8. Find the odd one out: 18, 19, 66, 78
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Answer: B. 19
All except 19 are multiples of 6.
Q9. Find the odd one out: 30, 54, 72, 74
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Answer: C. 74
All except 74 are multiples of 6.
Q10. Find the odd one out: 13, 53, 57, 61
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Answer: A. 57
All except 57 are prime numbers; 57 is composite.
Q11. Find the odd one out: 16, 18, 36, 289
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Answer: B. 18
All except 18 are perfect squares.
Q12. Find the odd one out: 13, 23, 39, 53
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Answer: A. 39
All except 39 are prime numbers; 39 is composite.
Q13. Find the odd one out: 13, 41, 57, 89
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Answer: A. 57
All except 57 are prime numbers; 57 is composite.
Q14. Find the odd one out: BCD, IJK, LMN, WXZ
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Answer: B. WXZ
In all groups except WXZ, consecutive letters are 1 apart. In WXZ the second gap is 2.
Q15. Find the odd pair: 3:27, 5:125, 6:216, 8:513
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Answer: A. 8:513
In each pair except 8:513, the second number is the cube of the first.
Q16. Find the odd one out: 16, 17, 64, 81
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Answer: C. 17
All except 17 are perfect squares.
Q17. Find the odd pair: 3:27, 4:63, 7:343, 8:512
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Answer: D. 4:63
In each pair except 4:63, the second number is the cube of the first.
Q18. Find the odd pair: 3:7, 4:9, 6:14, 8:17
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Answer: C. 6:14
In each pair except 6:14, the second number is 2 × first + 1.
Q19. Find the odd one out: 13, 61, 83, 87
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Answer: B. 87
All except 87 are prime numbers; 87 is composite.
Q20. Find the odd pair: 2:4, 3:9, 4:16, 11:122
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Answer: A. 11:122
In each pair except 11:122, the second number is the square of the first.
Q21. Find the odd pair: 5:11, 8:17, 11:23, 12:27
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Answer: D. 12:27
In each pair except 12:27, the second number is 2 × first + 1.
Q22. Find the odd one out: 65, 78, 81, 91
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Answer: A. 81
All except 81 are multiples of 13.
Q23. Find the odd pair: 3:9, 4:16, 7:50, 11:121
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Answer: D. 7:50
In each pair except 7:50, the second number is the square of the first.
Q24. Find the odd pair: 3:27, 4:65, 5:125, 8:512
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Answer: B. 4:65
In each pair except 4:65, the second number is the cube of the first.
Q25. Find the odd one out: 11, 53, 57, 73
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Answer: C. 57
All except 57 are prime numbers; 57 is composite.
Q26. Find the odd pair: 2:3, 5:25, 6:36, 12:144
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Answer: B. 2:3
In each pair except 2:3, the second number is the square of the first.
Q27. Find the odd pair: 3:10, 9:81, 11:121, 12:144
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Answer: A. 3:10
In each pair except 3:10, the second number is the square of the first.
Q28. Find the odd one out: 31, 59, 83, 91
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Answer: B. 91
All except 91 are prime numbers; 91 is composite.
Q29. Find the odd one out: 17, 47, 73, 87
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Answer: B. 87
All except 87 are prime numbers; 87 is composite.
Q30. Find the odd one out: 64, 169, 289, 291
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Answer: B. 291
All except 291 are perfect squares.
Q31. Find the odd one out: 42, 44, 54, 78
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Answer: A. 44
All except 44 are multiples of 6.
Q32. Find the odd one out: 100, 102, 121, 289
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Answer: A. 102
All except 102 are perfect squares.
Q33. Find the odd one out: 33, 37, 53, 83
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Answer: D. 33
All except 33 are prime numbers; 33 is composite.
Q34. Find the odd one out: 36, 49, 50, 196
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Answer: B. 50
All except 50 are perfect squares.
Q35. Find the odd one out: ACE, CEG, RTV, UWZ
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Answer: D. UWZ
In all groups except UWZ, consecutive letters are 2 apart. In UWZ the second gap is 3.
Q36. Find the odd one out: 49, 100, 225, 227
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Answer: B. 227
All except 227 are perfect squares.
Q37. Find the odd pair: 4:17, 5:25, 9:81, 11:121
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Answer: B. 4:17
In each pair except 4:17, the second number is the square of the first.
Q38. Find the odd one out: 24, 25, 36, 144
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Answer: B. 24
All except 24 are perfect squares.
Q39. Find the odd pair: 3:27, 4:64, 7:344, 8:512
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Answer: A. 7:344
In each pair except 7:344, the second number is the cube of the first.
Q40. Find the odd pair: 2:4, 4:16, 5:25, 11:122
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Answer: D. 11:122
In each pair except 11:122, the second number is the square of the first.
Q41. Find the odd one out: GJN, JMP, NQT, QTW
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Answer: B. GJN
In all groups except GJN, consecutive letters are 3 apart. In GJN the second gap is 4.
Q42. Find the odd pair: 3:7, 4:9, 5:11, 12:24
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Answer: C. 12:24
In each pair except 12:24, the second number is 2 × first + 1.
Q43. Find the odd pair: 2:8, 3:26, 6:216, 8:512
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Answer: B. 3:26
In each pair except 3:26, the second number is the cube of the first.
Q44. Find the odd pair: 5:25, 9:81, 11:121, 12:146
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Answer: C. 12:146
In each pair except 12:146, the second number is the square of the first.
Q45. Find the odd one out: 16, 63, 64, 144
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Answer: A. 63
All except 63 are perfect squares.
Q46. Find the odd one out: 35, 38, 70, 84
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Answer: C. 38
All except 38 are multiples of 7.
Q47. Find the odd one out: 32, 35, 72, 104
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Answer: B. 35
All except 35 are multiples of 8.
Q48. Find the odd one out: 32, 34, 48, 56
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Answer: B. 34
All except 34 are multiples of 8.
Q49. Find the odd one out: 28, 29, 77, 98
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Answer: C. 29
All except 29 are multiples of 7.
Q50. Find the odd one out: 45, 72, 108, 111
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Answer: C. 111
All except 111 are multiples of 9.
Q51. Find the odd one out: 35, 38, 56, 63
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Answer: D. 38
All except 38 are multiples of 7.
Q52. Find the odd one out: 52, 104, 156, 158
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Answer: D. 158
All except 158 are multiples of 13.
Q53. Find the odd one out: 143, 144, 324, 361
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Answer: A. 143
All except 143 are perfect squares.
Q54. Find the odd one out: GIL, IKM, JLN, SUW
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Answer: C. GIL
In all groups except GIL, consecutive letters are 2 apart. In GIL the second gap is 3.
Q55. Find the odd one out: EFH, HIJ, JKL, TUV
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Answer: C. EFH
In all groups except EFH, consecutive letters are 1 apart. In EFH the second gap is 2.
Q56. Find the odd pair: 2:8, 5:125, 7:343, 8:513
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Answer: C. 8:513
In each pair except 8:513, the second number is the cube of the first.
Q57. Find the odd pair: 5:11, 8:17, 11:25, 12:25
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Answer: D. 11:25
In each pair except 11:25, the second number is 2 × first + 1.
Q58. Find the odd pair: 2:5, 4:9, 8:18, 11:23
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Answer: B. 8:18
In each pair except 8:18, the second number is 2 × first + 1.
Q59. Find the odd pair: 3:27, 4:65, 7:343, 8:512
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Answer: D. 4:65
In each pair except 4:65, the second number is the cube of the first.
Q60. Find the odd one out: 40, 56, 88, 90
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Answer: A. 90
All except 90 are multiples of 8.
Q61. Find the odd one out: JLO, NPR, SUW, TVX
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Answer: B. JLO
In all groups except JLO, consecutive letters are 2 apart. In JLO the second gap is 3.
Q62. Find the odd pair: 4:16, 9:81, 10:100, 11:120
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Answer: C. 11:120
In each pair except 11:120, the second number is the square of the first.
Q63. Find the odd pair: 4:9, 7:15, 10:20, 12:25
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Answer: D. 10:20
In each pair except 10:20, the second number is 2 × first + 1.