Quantitative Aptitude: Number Series Questions – Set 52 (Odd One Out)

Directions: The following series are based on a specific pattern. One number in the series is wrong. Find that odd one out.

1. 2, 3, 2, 15, 42, 245, 1434
   A) 3
   B) 155
   C) 42
   D) 245
   E) 1434
   
   View Answer

    Option C
   Pattern: 
   2 × 1 + 1² = 3
   3 × 2 – 2² = 2
   2 × 3 + 3² = 15
   15 × 4 – 4² = 44
   44 × 5 + 5² = 245
   245 × 6 – 6² = 1434
   
2. 72, 74, 68, 80, 50, 90, 48 
   A) 74
   B) 68
   C) 80
   D) 50
   E) 90
   
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    Option D
   Pattern:
   ………+2………..-6………..+12………..-20…………+30………..-42
   ……………+4………+6………….+8………….+10……………+12
   
3. 6, 6, 8, 14, 25, 46, 76
   A) 8
   B) 14
   C) 25
   D) 46
   E) 76
   
   View Answer

    Option C
   Pattern: 
   6 + (1² – 1)  = 6
   6 + (2² – 2)  = 8
   8 + (3² – 3) = 14
   14 + (4² – 4)  = 26
   26 + (5² – 5)  = 46
   46 + (6² – 6)  = 76
   
4. 18, 82, 35, 69, 44, 60, 51
   A) 82
   B) 35
   C) 69
   D) 44
   E) 60
   
   View Answer

    Option B
   Pattern: 
   + 8², – 7², + 6², – 5², + 4², – 3²
5. 2, 14, 25, 82, 335, 1682, 10099
   A) 14
   B) 25
   C) 82
   D) 335
   E) 1682
   
   View Answer

    Option A
   Pattern: 
   2 × 1 + 7 = 9
   9 × 2 + 7 = 25
   25 × 3 + 7 = 82
   82 × 4 + 7 = 335
   335 × 5 + 7 = 1682
   1682 × 6+ 7 = 10099
6. 4, 12, 38, 76, 168, 356, 736
   A) 12
   B) 38
   C) 76
   D) 168
   E) 356
   
   View Answer

    Option B
   Pattern:
   ×2 + 4, ×2 + 8, ×2 + 12, ×2 + 16, ×2 + 20, ×2 + 24
7. 13, 12, 26, 81, 320, 1605, 9624
   A) 12
   B) 26
   C) 81
   D) 320
   E) 1605
   
   View Answer

    Option A
   Pattern: 
   × 1 + 1, × 2 – 2, × 3 + 3, × 4 – 4, × 5 + 5, × 6 – 6
8. 47, 53, 60, 71, 81, 127, 188
   A) 53
   B) 60
   C) 71
   D) 81
   E) 127
   
   View Answer

    Option D
   Pattern:
   ……..+6……….+7………+11……..+20…………+36……………+61
   ……………..+1………+4………+9………+16……………+25
9. 13, 8, 11, 28, 129, 1016
   A) 8
   B) 11
   C) 28
   D) 129
   E) 1016
   
   View Answer

    Option D
   Pattern: 
   13× 0.5 + 1.5 × 1 = 8
   8 × 1 + 1.5 × 2 = 11
   11 × 2 + 1.5 × 4 = 28
   28 × 4 + 1.5 × 8 = 124
   124 × 8 + 1.5 × 16 = 1016
10. 16, 39, 61, 81, 91, 105, 97
    A) 39
    B) 61
    C) 81
    D) 91
    E) 105
    
    View Answer

     Option D
    Pattern: 
    ……..+23………..+22……..+20………..+16……….+8……….-8
    ………………-1………….-2………..-4…………-8……………-16

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