Series Set – 4

1. 5, 9, 18, 38, 55, 85, 124
A) 18
B) 38
C) 9
D) 85
E) 55

Answer & Explanation

 Option B
Pattern: 

23 – 12, 33 – 22, 43 – 32, 53 – 42, ….

 

2. 9, 26, 65, 124, 217, 338, 513 
A) 124
B) 65
C) 338
D) 26
E) 217

Answer & Explanation

 Option C
Pattern: 

23 + 1, 33 – 1, 43 + 1, 53 – 1, 63 + 1, 73 – 1,

 

3. 9, 18, 40, 83, 170, 345, 696 
A) 18
B) 345
C) 40
D) 83
E) 170

Answer & Explanation

 Option A
Pattern: 

×2 + 1, ×2 + 2, ×2 + 3, ×2 + 4, ×2 + 5, ×2 + 6,

 

4. 512, 266, 132, 70, 40, 26, 20 
A) 40
B) 26
C) 132
D) 266
E) 70

Answer & Explanation

 Option D
Pattern: 

÷2 + 2, ÷2 + 3, ÷2 + 4, ÷2 + 5, ÷2 + 6,

 

5. 8, 29, 82, 241, 748, 2249, 6742 
A) 2249
B) 82
C) 29
D) 748
E) 241

Answer & Explanation

 Option E
Pattern: 

×3 + 5, ×3 – 5, ×3 + 5, ×3 – 5, ×3 + 5, ×3 – 5,..

 

6. 123, 126, 120, 144, 63, 306 
A) 126
B) 63
C) 144
D) 120
E) 306

Answer & Explanation

 Option C
Pattern: 

+ 3, – 32, + 33, – 34

 

7. 5, 6, 14, 27, 87, 112, 328 
A) 96
B) 287
C) 6
D) 112
E) 14

Answer & Explanation

 Option B
Pattern: 

+ 12, + 23, + 32, + 43, + 52, + 63

 

8. 11, 31, 9, 38, 7, 35, 5 
A) 31
B) 7
C) 9
D) 38
E) 35

Answer & Explanation

 Option D
Pattern: 

+20, -22, +24, -26, +28, -30

 

 

9. 18, 30, 14, 34, 10, 40, 6 
A) 34
B) 30
C) 14
D) 10
E) 40

Answer & Explanation

 Option E
Pattern: 

+12, -16, +20, -24, +28, -32

 

10. 8, 10, 6, 15, 52.5, 236.25 
A) 52.5
B) 15
C) 10
D) 6
E) 236.25

Answer & Explanation

 Option C
Pattern: 

× 0.5, × 1.5, × 2.5, × 3.5, ×4.5

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