Number Series Reasoning Questions - Set 9

Advanced 467 Reasoning Puzzles Book SBI PO 2018

Number Series Questions

Nowadays, almost in all competitive exams series reasoning questions are must ask and especially in Bank Recruitment Exams.

Most Bank PO Exams including IBPS PO, SBI PO, and other exams ask 5-10 questions from Number Series like find the next number in the series. It is very important to practice difficult number series questions, as they can generally be solved in short span of time with high accuracy. If you learn that 
how to solve number series problems quickly you may easily get 5 to 10 marks. Today, we have 20 difficult number series questions to help you practice Number Series. As usual, answers and solution are following the questions.


Following are some  Number Series questions which are likely to be asked/ already asked in competitive exams. Following  Number Series questions will help you securing good marks in upcoming SBI PO, SBI Clerk, IBPS PO­, IBPS Clerk­, IBPS RRB Exams in 2017 2018.

Number Series Test

Directions (1 - 17) : What should come in place of the question mark (?) in the following number series ?

1. 15 12 17 10 ? 8 21 6
(1) 3 
(2) 7
(3) 21 
(4) 19
(5) None of these

2. 4 6 12 30 90 315 ?
(1) 945 
(2) 1102
(3) 1260 
(4) 1417.5
(5) None of these

3. 1548 516 129 43 ?
(1) 11 
(2) 10.75
(3) 9.5 
(4) 12
(5) None of these

4. 949 189.8 ? 22.776 11.388 6.8328
(1) 48.24 
(2) 53.86
(3) 74.26 
(4) 56.94
(5) None of these

5. 121 144 190 259 ? 466
(1) 351 
(2) 349
(3) 374 
(4) 328
(5) None of these

6. 14 43.5 264 ? 76188
(1) 3168 
(2) 3176
(3) 1587 
(4) 1590
(5) None of these

7. 41 164 2624 ? 6045696
(1) 104244 
(2) 94644
(3) 94464 
(4) 102444
(5) None of these

8. 12 12 18 45 180 1170 ?
(1) 12285 
(2) 10530
(3) 11700 
(4) 12870
(5) 7605

9. 444 467 513 582 674 789 ?
(1) 950 
(2) 904
(3) 927 
(4) 881
(5) 973

10. 1 16 81 256 625 1296 ?
(1) 4096 
(2) 2401
(3) 1764 
(4) 3136
(5) 6561

11. 23 25 53 163 657 3291 ?
(1) 16461 
(2) 13169
(3) 9877 
(4) 23045
(5) 19753

12. 13 13 65 585 7605 129285 ?
(1) 2456415 
(2) 2235675
(3) 2980565 
(4) 2714985
(5) 2197845

13. 40280625 732375 16275 465 18.6 1.24 ?
(1) 0.248 
(2) 0.336
(3) 0.424 
(4) 0.512
(5) 0.639

14. 14 12 21 59 231 1149 ?
(1) 6987 
(2) 6787
(3) 6887 
(4) 6687
(5) 6587

15. 1728 2744 4096 5832 8000 10648 ?
(1) 12167 
(2) 13824
(3) 15625 
(4) 9261
(5) 17576

16. 120 15 105 17.5 87.5 ?
(1) 18.5 
(2) 19.5
(3) 21.875 
(4) 17.5
(5) 90

17. 3 6 21 28 55 66 ? 120
(1) 103 
(2) 104
(3) 108 
(4) 106
(5) 105

Directions (18 - 20) : In each of the following questions a number series is given which has only one wrong number. You have to find out the wrong number.

18. 7.25 47.5 87.5 157.5 247.5 357.5 487.5
(1) 357.5 
(2) 87.5
(3) 157.5 
(4) 7.5
(5) 47.5

19. 13 16 21 27 39 52 69
Number Series Questions Answers IBPS SBI SSC UPSC RRB(1) 21 
(2) 39
(3) 27 
(4) 52
(5) 16

20. 1500 1581 1664 1749 1833 1925 2016
(1) 1581 
(2) 1664
(3) 1833 
(4) 1925 
(5) 1749

Number Series Solutions

1. (4) The given series is based on the following pattern:


Hard Number Series Questions Bank

Hence, 19 will come in place of the question mark.

2. (3) The given series is based on the following pattern :


Number Series Questions For Bank PO

Hence, 1260 will come in place of the question mark.

3. (2) The given number series is based on the following pattern :


Hard Number Series Questions Bank PO

Hence, 10.75 will replace the question mark.

4. (4) The given number series is based on the following pattern :


Hard Number Series Questions For Bank PO

Hence, 56.94 will replace the question mark.

5. (1) The given number series is based on the following pattern :
121 + 23 × 1 = 144
144 + 23 × 2 = 190
190 + 23 × 3 = 259
? = 259 + 23 × 4
= 259 + 92 = 351
Hence, 351 will replace the question mark.

6. (5) The given number series is based on the following pattern :
14 × 3 + 1.5 = 43.5
43.5 × 6 + 1.5 × 2 = 264
264 × 12 + 1.5 × 4= 3174
3174 × 24 + 1.5 × 8 = 76188
Hence, 3174 will replace the question mark.

7. (3) The given number series is based on the following pattern :
41 ×  = 164
164 × 4² = 2624
2624 × 6² = 94464
94464 × 8² = 6045696
Hence, 94464 will replace the question mark.

8. (1) The given number series is based on the following pattern :
12 × 1 = 12
12 × 1.5 = 18
18 × (1 + 1.5) = 18 × 2.5 = 45
45 × (1.5 + 2.5) = 45 × 4 = 180
180 × (4 + 2.5) = 180 × 6.5 = 1170
? = 1170 × (4 + 6.5) = 12285
Hence, 12285 will replace the question mark.

9. (3) The given number series is based on the following pattern :
467 - 444 = 23 = 23 × 1
513 - 467 = 46 = 23 × 2
582 - 513 = 69 = 23 × 3
674 - 582 = 92 = 23 × 4
789 - 674 = 115 = 23 × 5
? = 789 + 23 × 6 = 789 + 138 = 927
Hence, 927 will replace the question mark.

10. (2) The given number series is based on the following pattern :
1 = l4
16 = 24;
81 = 34
256 = 44;
625 = 54
1296 = 64;
? = 74 = 7 × 7 × 7 × 7 = 2401
Hence, 2401 will replace the question mark.

11. (5) The given number series is based on the following pattern :
23 × 1 + 2 = 25
25 × 2 + 3 = 53
53 × 3 + 4 = 163
163 × 4 + 5 = 657
657 × 5 + 6 = 3291
? = 3291 × 6 + 7 = 19746 + 7 = 19753
Hence, 19753 will replace the question mark.

12. (4) The given number series is based on the following pattern :
13 × 1 = 13
13 × 5 = 65
65 × 9 = 585
585 × 13 = 7605
7605 × 17 = 129285
? = 129285 × 21 = 2714985
Hence, 2714985 will replace the question mark.

13. (1) The given number series is based on the following pattern :
40280625 ÷ 55 = 732375
732375 ÷ 45 = 16275
16275 ÷ 35 = 465
465 ÷ 25 = 18.6
18.6 ÷ 15 = 1.24
? = 1.24 ÷ 5 = 0.248
Hence, 0.248 will replace the question mark.

14. (3) The given number series is based on the following pattern :
14 × 1 - 2 = 14 - 2 = 12
12 × 2 - 3 = 24 - 3 = 21
21 × 3 - 4 = 63 - 4 = 59
59 × 4 - 5 = 236 - 5 = 231
231 × 5 - 6 = 1155 - 6 = 1149
? = 1149 × 6 - 7 = 6894 - 7 = 6887
Hence, 6887 will replace the question mark.

15. (2) The given number series is based on the following pattern :
12 × 12 × 12 = 1728
14 × 14 × 14 = 2744
16 × 16 × 16 = 4096
18 × 18 × 18 = 5832
20 × 20 × 20 = 8000
22 × 22 × 22 = 10648
? = 24 × 24 × 24 = 13824
Hence, 13824 will replace the question mark.

16. (3) The given number series is based on the following pattern :
120 ÷ 8 = 7
15 × 7 = 105
105 ÷ 6 = 17.5
17.5 × 5 = 87.5
= 87.5 ÷ 4 = 21.875
Hence, 21.875 will replace the question mark.

17. (5) The given number series is based on the following pattern :


Hard Number Series

Hence, 105 will replace the question mark.

18. (5) The given number series is based on the following pattern :
487.5 - 357.5 = 130
357.5 - 247.5 = 110
247.5 - 157.5 = 90
157.5 - 87.5 = 70
87.5 - 47.5 = 40
87.5 - 37.5 = 50
37.5 - 7.5 = 30
Clearly, 47.5 is the wrong number. It should be replaced by 37.5.

19. (3) The given number series is based on the following pattern :
13 + 3 = 16
16 + 5 = 21
21 + 7 = 28  27
28 + 11 = 39
39 + 13 = 52
52 + 17 = 69
Clearly, 27 is the wrong number. It should be replaced by 28.

20. (3) The given number series is based on the following pattern :
1500 + 81 = 1581
1581 + 83 = 1664
1664 + 85 = 1749
1749 + 87 = 1836  1833
1836 + 89 = 1925
1925 + 91 = 2016
Clearly, 1833 is the wrong number. It should be replaced by 1836.