Series Set – 2

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

Answer & Explanation

 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

Answer & Explanation

 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

Answer & Explanation

 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

Answer & Explanation

 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

Answer & Explanation

 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

Answer & Explanation

 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

Answer & Explanation

 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

Answer & Explanation

 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

Answer & Explanation

 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

Answer & Explanation

 B) 432
Pattern: 

×2 + 11, ×2 + 12, ×2 + 13, ×2 + 14, ×2 + 15,

 

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