Quantitative Aptitude: Number Series Set 2

Directions: What will come in place of (?) in the following series which follows a particular pattern?

1. 7, 5, 7, 17, 63, 309, ?
   A) 1639
   B) 1847
   C) 1750
   D) 1829
   E) 1689
   
   View Answer

   B) 1847
   Pattern:
   7*1 – 2, 5*2 – 3, 7*3 – 4, 17*4 – 5, 63*5 – 6, 309*6 – 7
   
2. 10, 68, 222, 520, 1010, ?
   A) 1950
   B) 1840
   C) 1740
   D) 1010
   E) None of these
   
   View Answer

   C) 1740
   Pattern:
   2^3 + 2, 4^3 + 4, 6^3 + 6, 8^3 + 8, 10^3 + 10
   
3. 168, 120, 80, 48, ?, 8
   A) 30
   B) 12
   C) 14
   D) 24
   E) 29
   
   View Answer

   D) 24
   Pattern:
   13² – 1, 11² – 1, 9² – 1, 7² – 1, 5² – 1, 3² – 1
4. 5, 7, 17, 31, 65, ?
   A) 95
   B) 115
   C) 102
   D) 127
   E) 150
   
   View Answer

   D) 127
   Pattern:
   5*2 – 3, 7*2 + 3, 17*2 – 3, 31*2 + 3, 65*2 – 3
5. 10, 15, 28, 49, 78, ?
   A) 122
   B) 102
   C) 117
   D) 136
   E) None of these
   
   View Answer

   E) None of these
   Pattern:
   15-10 = 5, 28-15 = 13, 49-28 = 21, 78-49 = 29
   13-5 = 8, 21-13 = 8, 29-21 = 8
   So next number is 78+29+8 = 115
   
6. 12, 24, 27, 54, 57, ?
   A) 116
   B) 106
   C) 114
   D) 122
   E) 146
   
   View Answer

   C) 114
   Pattern:
   12*2, 24+3, 27*2, 54+3, 57*2
7. 3, 18, 33, 68, 95, ?
   A) 168
   B) 159
   C) 162
   D) 150
   E) 177
   
   View Answer

   D) 150
   Pattern:
   2² – 2/2, 4² + 4/2, 6² – 6/2, 8² + 8/2, 10² – 10/2, 12² + 12/2
8. 16, 41, 61, 85, ?, 145
   A) 124
   B) 167
   C) 119
   D) 113
   E) 185
   
   View Answer

   D) 113
   Pattern:
   4^2, 4^2 + 5^2, 5^2 + 6^2, 6^2 + 7^2,….
   
9. 25, 13, 21, 55, 196, ?
   A) 892.5
   B) 942.5
   C) 758.5
   D) 828.5
   E) 886.5
   
   View Answer

   E) 886.5
   Pattern:
   ×0.5 + 0.5, ×1.5 + 1.5, ×2.5 + 2.5, ×3.5 + 3.5, ×4.5 + 4.5,
10. 16, 43, 98, 209, ?, 879
    A) 428
    B) 432
    C) 386
    D) 422
    E) 396
    
    View Answer

    B) 432
    Pattern:
    ×2 + 11, ×2 + 12, ×2 + 13, ×2 + 14, ×2 + 15,