Series Set – 7

1. 9, 73, 241, 561, ?
A) 946
B) 1036
C) 1238
D) 1081
E) 1141

Answer & Explanation

 Option D
Pattern: 

12 + 23, 32 + 43, 52 + 63, 72 + 83

 

2. 3, 9, 19, 34, 55, ?
A) 79
B) 83
C) 66
D) 90
E) 68

Answer & Explanation

 Option B
Pattern: 

3 + (1+2+3) = 9, 9 + (1+2+3+ 4) = 19, 19 + (1+2+3+ 4+5) = 34, 34 + (1+2+3+ 4+5+6) = 55, 55 + (1+2+3+ 4+5+6+7) = 83

 

3. 16, 14, 17, 12, 19, 8, ?
A) 29
B) 20
C) 21
D) 34
E) 44

Answer & Explanation

 Option C
Pattern: 

-2, +3, -5, +7, -11, +13

 

4. 12, 53, 96, 143, 196, 255, ?
A) 355
B) 316
C) 452
D) 325
E) 332

Answer & Explanation

 Option B
Pattern: 

+41, +43, +47, +53, +59, +61 – consecutive prim numbers addition

 

5. 48, 24, 36, 90, 315,
A) 1767.5
B) 1234.5
C) 1113.5
D) 1417.5
E) 1218.5

Answer & Explanation

 Option D
Pattern: 

×0.5, ×1.5, ×2.5, ×3.5, ×4.5,

 

6. 386, 265, 365, 284, 348, ?
A) 257
B) 176
C) 299
D) 175
E) 224

Answer & Explanation

 Option C
Pattern: 

386 – 112, 386 + 102, 386 – 92, 386 + 82

 

7. 20, 10, 8, 8.4, 10.4, ?
A) 17.25
B) 18.78
C) 11.24
D) 19.85
E) 14.48

Answer & Explanation

 Option E
Pattern: 

20 × 2/5 + 2 = 10
10 × 3/5 + 2 = 8
8 × 4/5 + 2 = 8.4
8.4 × 5/5 + 2 = 10.4
10.4 × 6/5 + 2 = 14.48

 

8. 8, 18, 39, 82, ?, 344
A) 169
B) 192
C) 111
D) 120
E) 144

Answer & Explanation

 Option A
Pattern: 

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

 

9. 1, 3, 11, 13, 29, ?
A) 35
B) 47
C) 26
D) 31
E) 43

Answer & Explanation

 Option D
Pattern: 

12 + 0, 22 – 1, 32 + 2, 42 – 3, 52 + 4

 

10. 16, 27, 42, 139, 542, ?
A) 1220
B) 2725
C) 2311
D) 1817
E) 2112

Answer & Explanation

 Option B
Pattern: 

16 * 1 + 11 = 27
27 * 2 – 12 = 42
42 * 3 + 13 = 139
139 * 4 – 14 = 542
542 * 5 + 15 = 2725

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