Full Set of Number Series asked in Previous Year IBPS RRB (Clerk/PO) Prelims Exam with Detailed Solution

Full Set of Number Series asked in Previous Year IBPS RRB (Clerk/PO) Prelims Exam with Detailed Solution:

Dear Readers, Here we have given the full set of Number Series Questions asked in Previous Year IBPS RRB Prelims (Clerk/PO) Exam with Detailed Solution. Candidates those who are preparing for IBPS RRB 2017 can make use it.

Full Set of Number Series asked in Previous Year IBPS RRB (Clerk/PO) Prelims:
Credits: www.ibpsguide.com
1). 4, 4, 6, 12, 24, ?

Solution: (Difference of Difference)

2). 3, 1.5, 1.5, 2.25, 4.5, ?

×0.5, ×1, ×1.5, ×2, ×2.25

Answer is- 11.25

3). 2, 4, 11, 37, 153, ?

(2×1)+2=4

(4×2)+3=11

(11×3)+4=37

(37×4)+5=153

(153×5)+6=771

Answer is- 771

4). 9, 14, 21, 32, 45, ?

Solution: (Difference)

 

5). 3, 10, 22, 39, 61, ?

Solution: (Difference)

6). 2, 7, 14, 25, 38, ?

Solutions : Difference of Difference

2+5 (5+2) = 7

7+7 (7+4) = 14

14 + 11(11+2) = 25

25+ 13 (13+4) = 38

38 + 17 (17+2) = 55

7). 6, 6, 8, 14, 26, ?

Solutions: Difference of Difference – 2,4,6,8

6+0 (0+2) = 6

6+2 (2+4)= 8

8+6 (6+6)= 14

14+12 (12+8) = 26

26+20 (20+10) = 46

8). 3, 5, 13, 43, 177, ?

Solutions:

13×3+4=43

43×4+5=177

177×5+6=891

Answer: 891

9). 4, 2, 2, 3, 6, ?

Solutions:

X0.5, x1, x1.5, x2, x2.5… = 15

10). 3, 9, 22, 42, 69, ?

Solutions : Difference of Difference

9+13 (6+7) = 22

22+20 (13+7) = 42

42+27 (20+7) = 69

69+34 (27+7) = 103

11). 3, 8, 15, 26, 39, ?

Solution: (Difference of prime number)

Answer- 56

12). 5, 5, 7, 13, 25, ?

Solution: (Difference of Difference- 2, 4, 6, 8, 10)

5+0(0+2)=5

5+2(2+4)=7

7+6(6+6)=13

13+12(12+8)=25

25+20(20+10)=45

Answer- 45

13). 5, 11, 24, 71, ?

i. 5+6= 11

(6×2+1³) = 13 Difference of Difference

ii.  11+13= 24

(13×3+2³) = 47 Difference of Difference

iii. 24+47= 71

(47×4+3³) = 215 Difference of Difference

iv. 71+215= 286

Answer-286

14). 1, 3, 9, 31, 129, ?

1×1+2, 3×2+3, 9×3+4, 31×4+5, 129×5+6

Answer- 651

15). 8, 4, 4, 6, 12, ?

8×0.5, 4×1, 4×1.5, 6×2, 12×2.5

Answer- 30

16).  3, 1.5, 1.5, 2.25, 4.5, ?     

 3×.5= 1.5

1.5×1=1.5

1.5×1.5=2.25

2.25x2 = 4.5

4.5x2.5=11.25.

Answer- 11.25

17).  2, 4, 11, 37, 153, ?         

4×2+3= 11

11×3+4= 37

37x4+5 = 153

153x5+6 = 771

Answer- 771

18).  9, 14, 21, 32, 45, ?           

Difference of Prime No: 5, 7, 11, 13, 15, 17

Answer: 62

19).  4, 4, 6, 12, 24, ?

12+12 = 24

24+20 = 44

Answer- 44

diff of diff 2, 4, 6, 8

20).  4, 3, 4.5, 8.75, 20, ? .                       

4*0.5+1= 3

3*1+1.5= 4.5

4.5*1.5+2=8.75

8.75*2+2.5= 20

20*2.5+3 = 53

Answer- 53

21). 6, 4, 5, 11, 39, ?

6×1-2=4, 4×2-3=5, 5×3-4=11, 11×4-5=39, 39×5-6=189

22). 14, 7, 7, 14, 56, ?

14×0.5=7, 7×1=7, 7×2=14, 14×4=56, 56×8=448

23). 2, 3, 7, 16, 32, ?

2+1²=3, 3+2²=7, 7+3²=16, 16+4²=32, 32+5²=57

24). 8, 14, 24, 38, 56, ? 

Difference of Difference 4, 4, 4, 4, 4,4

25). 5, 7, 13, 25, 45, ?

Difference of Difference 4, 6, 8, 10.

26). 12, 6, 12, 48 ?

12 x 4 = 48

48 x 8 = 384

27). 4, 5, 9, 18, 34, 59, ?

Solution:
Difference +1²,  + 2², + 3²

28). 14, 24, 38, 56, 78 ?

Difference of Difference 4, 4, 4, 4

29). 8, 6, 9, 23, 87 ? 

Difference x1-2, x2-3, x3-4...

30). 12.5, 14.5, 18.5, 24.5, ?

Difference 2, 4, 6, 8,  of deference 2,2,2,2 

31). 4, 16, 26, 34, 40, ?

Difference of 12,10,8,6, ....

Answer is-  44

32). 825, 582, 501, 474, 465, ?

Difference of 3⁵,3⁴,3³,3^2, 3¹

Answer is - 462

33). 8, 12, 24, 60, 180, ?

×1.5, ×2, ×2.5, ×3, ×3.5

Answer is- 630

34). 3, 4, 10, 33, 136, ?

3×1+1, 4×2+2, 10×3+3, 33×4+4, 136×5+5

Answer is- 685

35). 16, 17, 13, 22, 6, ?

Difference= +1², -2², +3², -4², +5²

Answer is = 31

36). 8,4,4,6,12, ?
37). 157,150,136,115,87,?
38). 1,4,18,44,83, ?
39). 1,2,8,48,? 
40). 12,13,17,26,42, ?

36). Diff x0.5, x1, x1.5, x2, x2.5
8x 0.5 = 4
4x 1 = 4
4x 1.5 = 6
6x 2 = 12
12x 2.5 = 30

37). Diif of Diff  7, 7, 7, 7,7
157-7=150
150-14=136
136-21=115
115-28= 87
87-35 = 52

38).Diff of Diff = 11, 12, 13, 14
1 +3 = 4   Diff (11)
4 + 14 = 18   Diff (12)
18 + 26 = 44   Diff (13)
44 + 39 = 83   Diff (14)
83 + 53 = 136

39).
1x 2 = 2
2x 4 = 8
8x 6 = 48
48x 8 = 384

40). Diff of Diff is 1^1, 2^2, 3^2, 4^2
12+1=13
13+4=17
17+9=26
26+16=42
42+25=67

41). 3, 6, 24, 144, 1152

Sol: ×2, ×4, ×6, ×8, ×10

Answer- 11520

42). 2, 4, 17, 42, 80

Sol: Difference of Difference 11, 12, 13, 14

Answer: 132

43). 11, 12, 16, 25, 41

Sol: Difference +1², 2², 3², 4², 5²

Answer: 66

44). 116, 160, 148, 130, 106

Sol: Difference of Difference -6, -6, -6, -6

Answer- 70

50). Logic- ×0.5, ×1, ×1.5, ×2..

51). 1,   4,   24,   60,   111,   ?

Logic: Difference of Difference (+17, +16, +15, +14)

Answer- 176

52). 192,   ?   48,   24,   12,   6

Answer- 96

53). 5,   14,   39,   88,   169,   ?

Logic: Difference of 3², 5², 7², 9², 11²

Answer- 290

54). 12,    12,   24,   72,   288,   ?

288x5=1440

Answer- 1440

55). 307,   300,   286,   258,   202, ?

Logic: Difference of (-7, -14, -28, -56, -112)

Answer- 90

56). 4   13   38   87   168   ?

Logic: Difference of Difference (+3², +5², +7², +9², 11²)

Answer- 289

57). 224   ?   56   28   14

Answer- 112

58). 2   4   23   58   108   ?

Logic: Difference 2, 19, 35, 50, 64

Difference of Difference (+17, +16, +15, +14)

Answer- 172

59). 11   11   22   66   264   ?

264x5 = 1320

Answer- 1320

60). 216   210   198   174   126   ?

Logic: Difference 6, 12, 24, 48, 96

Differece of Differece 6 x 2¹, 6x2², 6x2³, 6x2⁴

Answer- 30

61). 10, 12, 16, 24, 40, ?

Logic: Difference of: 2, 4, 8, 16, 32…

Answer is: 72

62). 402, 400, 394, 376, 322, ?

Logic: Difference × 3, Difference × 3, Difference × 3..

Answer is: 160

63). 1, 3, 15, 105, ?

Sol- 1×3=3

105×9= 945

Answer is: 945

64). 8, 28, 46, 61, 72, ?

Logic: Difference of Difference 2, 3, 4, 5…

Answer is: 78

65). 120, 24, 6, 2, ?, 1

Sol: 120÷5=24

Answer is: 1
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