## Number Series asked in RRB PO Prelims

Number Series asked in RRB PO Prelims 2017. Welcome to the www.letsstudytogether.co online learning section.  If you are preparing for Bank and other competitive exams, you will come across Number series section on Quantitative Aptitude.

Today we are sharing the Number Series asked in RRB PO Prelim 2017 9th & 10th September 2017 (All Slots) which is very important for the aspirants who are going to appear for IBPS RRB PO/Clerk Prelims Exam 2018.

## Number Series asked in RRB PO Prelim 2017

1.  190, 94, 46, 22 ? 4

A. 12
B. 10
C. 22
D. 30
E. 16

190 – 2 = 188/2 = 94
94 – 2 = 92, 92/2 = 46
46 – 2 = 44, 44/2 = 22
22 – 2 = 20, 20/2 = 10

2.  7, 4, 5, 12, 52, ?

A. 430
B. 420
C. 424
D. 104
E. 124

7 * 0.5 + 0.5 = 4

4*1+1= 5

5*2+2=12

12*4+4=52

52*8+8=424

3.  6, 4, 5, 11, 39, ?

A. 219
B. 199
C. 221
D. 89
E. 189

189

*1 – 2, *2 – 3, *3 – 4, *4 – 5, *5 – 6

4.  89, 88, 85, 78, 63, ?

A. 22
B. 32
C. 42
D. 52
E. 120

32

-1, -3, -7, -15, -31

5.  5, 28, 47, 64, 77, ?

A. 98
B. 110
C. 88
D. 92
E. 96

88

+23, +19, +17, +13, +11

6.  7, 6, 10, 27, 104, ?

A. 530
B. 515
C. 488
D. 509
E. 511

515

*1 – 1, *2 – 2, *3 – 3, *4 – 4, *5 – 5

7.   19, 9, 8, 14, 39, ?

A. 185
B. 515
C. 142
D. 509
E. 152

152

*0.5 – 0.5, *1 – 1, *2, – 2, *3 – 3, *4 – 4

8. 102, 101, 98, 91, 76, ?

A. 37
B. 45
C. 50
D. 33
E. 40

45

-1, -3, -7, -15, -31

9.  728, 242, 80, 26, ?, 2

A. 8
B. 10
C. 16
D. 32
E. 24

8

728 – 2 = 726, 726/3 = 242
242 – 2 = 240, 240/3 = 80
80 – 2 = 78, 78/3 = 26
26 – 2 = 24, 24/3 = 8

10.   4, 46, 86, 122, 156, ?

A. 197
B. 205
C. 196
D. 186
E. 190

186

+42, +40, +36, +34, +30

11.  131, 67, 35, 19, 11, ?

A. 18
B. 8
C. 14
D. 7
E. 9

7

131 – 64 = 67

67 – 32 = 35

35 – 16 = 19

19 – 8 = 11

11 – 4 = 7

12. 25, 28, 22, 31, 19, ?

A. 44
B. 24
C. 20
D. 36
E. 34

34

25 +3 = 28

28 – 6 = 22

22 + 9 = 31

31 – 12 =19

19 + 15 = 34

13. 7, 4.5, 6, 11, ?

A. 20.5
B. 26.5
C. 50.5
D. 24.5
E. 16.5

24.5

7 x 0.5 + 1 = 4.5

4.5 x 1 + 1.5 = 6

6 x 1.5 + 2 = 11

11 x2 + 2.5 = 24.5

14. 1, 4, 9, 18, 35, ?

A. 68
B. 52
C. 112
D. 52
E. 72

68

1 + 3 = 4

4 + 5 = 9

9 + 9 = 18

18 + 17 = 35

35+ 33 = 68

15.   3.5, 4, 8, 27, ?, 767

A. 119
B. 129
C. 189
D. 92
E. 123

129

3.5 x 2 – 3 = 4

4 x 3 – 4 = 8

8 x 4 – 5 = 27

27 x 5 – 6 = 129

129×6 – 7 = 767

16.  2, 13, 26, 43, 62, ?

A. 81
B. 85
C. 77
D. 83
E. 61

85

+11 +13 +17+ 19+ (+23)

+2 +4 +2 +4

17.   519, 517, 509, 483, 403, ?

A. 185
B. 515
C. 142
D. 509
E. 152

161

-2  -8  -26  – 80  (- 242)

6   18   54  ( 162)

Difference of Difference: ×3

18. 1094, 365, 122, 41, 14, ?

A. 24
B. 15
C. 5
D. 17
E. 21

5

34×9, 33×9, 32×9, 31×9, 30×9

19. 7, 3, 2, 2, 4, ?

A. 8
B. 10
C. 16
D. 32
E. 24

24

×0.5-0.5, ×1-1, ×2-2, ×4-4, ×8-8

20.   1.5, 3.5, 10, 34, ?, 711

A. 122
B. 162
C. 147
D. 141
E. 139

141

×1+2, ×2+3, ×3+4, ×4+5