# Aptitude Questions: Number Series Set 51

Hello Aspirants. Welcome to Online Quantitative Aptitude Section in AffairsCloud.com. Here we are creating question sample in Number Series, which is common for all the competitive exams. We have included Some questions that are repeatedly asked in bank exams !!!

1. 12 42 156 606 2400 ?
A. 9186
B. 9470
C. 9570
D. 9486
E. None of these
Answer – C. 9570
Explanation :
(12 * 4) – 6 = 48 – 6 = 42
(42 * 4) – 12 = 168 – 12 = 156
(156 * 4) – 18 = 624 – 18 = 606
(606 * 4) – 24 = 2424 – 24 = 2400
(2400 * 4) – 54 = 9600 – 30 = 9570

2. 18 9 11 ? 109 544
A. 34
B. 28
C. 24
D. 14
E. None of these
Answer – B. 28
Explanation :
18*1 – 9 = 9
9*2 – 7 = 11
11*3 – 5 = 28

3. 14 26 62 122 206 ?
A. 310
B. 312
C. 314
D. 313
E. None of these
Answer – C. 314
Explanation :
14 + (1 * 12) = 14 + 12 = 26
26 + (3 * 12) = 26 + 36 = 62
62 + (5 * 12) = 62 + 60 = 122
122 + (7 * 12) = 122 + 84 = 206
206 + (9 * 12) = 206 + 108 = 314

4. 364 362 371 343 ? 282
A. 402
B. 404
C. 406
D. 408
E. None of these
Answer – D. 408
Explanation :
364 – 1³ + 1 = 362
362 + 2³ + 1 = 371
371 – 3³ + 1 = 343

5. 6 8 16 42 122 ?
A. 364
B. 366
C. 362
D. 361
E. None of these
Answer – A. 364
Explanation :
6 + 2 = 8
8 + 8(= 3 * 2 + 2) = 16
16 + 26(= 3 * 8 + 2) = 42
42 + 80(= 3 * 26 + 2) = 122
122 + 242(= 3 * 80 + 2) = 364

6. 15 44 121 342 ? 2944
A. 976
B. 995
C. 973
D. 978
E. None of these
Answer – B. 995
Explanation :
15*3 – 1 = 44
44*3 – 11 = 121
121*3 – 21 = 342

7. 61 49 57 41 45 ?
A. 58
B. 32
C. 60
D. 25
E. None of these
Answer – D. 25
Explanation :

8. 6 12 72 ? 10080
A. 720
B. 816
C. 879
D. 980
E. None of these
Answer – A. 720
Explanation :
6 * (1 + 1) = 12
12 * (3 + 3) = 72
72 * (5 + 5) = 720
720 * (7 + 7) = 10080

9. 5 6 14 45 ? 925
A. 150
B. 155
C. 140
D. 184
E. None of these
Answer – D. 184
Explanation :
(5*1)+1 = 6
(6*2)+2 = 14
(14*3)+3 = 45
(45*4)+4 = 184

10. 2 12 36 80 150 ?
A. 270
B. 275
C. 260
D. 252
E. None of these
Answer – D. 252
Explanation :
1³ + 1², 2³ + 2², 3³ + 3², 4³ + 4²….

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