# Aptitude Questions: Number Series Set 32

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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 !!!

Directions(1-10) : In these questions, a number series is given. Only one number is wrong which does not fit in the series. Find out the wrong number.

1. 5 7 16 57 244 1245 7506
A. 5
B. 16
C. 7506
D. 7
E. None of these
Answer – D. 7
Explanation :
(5 * 1) + 1² = 6
(6 * 2) + 2² = 16….
Correct Number: 6

2. 5 3 4 7.5 17 47 138
A. 5
B. 4
C. 47
D. 17
E. None of these
Answer – C. 47
Explanation :
5 * 0.5 + 0.5 = 3
3 * 1 + 1 = 4
4 * 1.5 + 1.5 = 7.5…..
Correct Number: 45

3. 3 5 13 43 178 891 5353
A. 43
B. 178
C. 891
D. 5353
E. None of these
Answer – B. 178
Explanation :
3 * 1 + 2 = 5
5 * 2 + 3 = 13
13 * 3 + 4 = 43…..
Correct Number: 177

4. 972 484 240 118 56 26.5 11.25
A. 240
B. 11.25
C. 118
D. 56
E. None of these
Answer – D. 56
Explanation :
972 / 2 – 2 = 484
484 / 2 – 2 = 240
240 / 2 – 2 = 118…..
Correct Number: 57

5. 25 313 457 529 565 585 592
A. 457
B. 592
C. 313
D. 529
E. None of these
Answer – E. None of these
Explanation :
25 + 9 * 32 = 313
313 + 9 * 16 = 457
457 + 9 * 8 = 529….
Wrong Number: 585
Correct Number: 583

6. 25 35 50 75 110 155 210
A. 50
B. 210
C. 25
D. 110
E. None of these
Answer – C. 25
Explanation :
30 + 5 * 1 = 35
35 + 5 * 3 = 50
50 + 5 * 5 = 75…..
Wrong Number: 25
Correct Number: 30

7. 900 890 879 858 830 795 753
A. 753
B. 795
C. 890
D. 858
E. None of these
Answer – C. 890
Explanation :
900 – 7 = 893
893 – 14 = 879
879 – 21 = 858……
Wrong Number: 890
Correct Number: 893

8. 16800, 7770, 1290, 3120, 1000, 240, 30
A. 1000
B. 7770
C. 3120
D. 78
E. None of these
Answer – A. 1000
Explanation :
7^5 – 7, 6^5 – 6, 5^5 – 5, 4^5 – 4…
Wrong Number: 1000
Correct Number: 1020

9. 15 22 32 111 428 1538 12900
A. 22
B. 428
C. 1538
D. 12900
E. None of these
Answer – D. 12900
Explanation :
15 * 1 + (1 * 7) = 22
22 * 2 – (2 * 6) = 32
32 * 3 + (3 * 5) = 111
111 * 4 – (4 * 4) = 428
428 * 5 + (5 * 3) = 2155
2155 * 6 – (6 * 2) = 12918
Correct Number: 12918

10. 2580 645 322.5 80.62 45 10.07 5
A. 322.5
B. 645
C. 45
D. 10.07
E. None of these
Answer – C. 45
Explanation :
2580 * 0.25 = 645
645 * 0.5 = 322.5
322.5 * 0.25 = 80.62
80.62 * 0.5 = 40.31 …..
Correct Number: 40.31

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