# 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 RRBÂ (Clerk/PO)Â 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).Â 4, 4, 6, 12, 24, ?

Solution: (Difference of Difference)
2).Â 3, 1.5, 1.5, 2.25, 4.5, ?
Solution:
Ã—0.5, Ã—1, Ã—1.5, Ã—2, Ã—2.25
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3).Â 2, 4, 11, 37, 153, ?
Solution:
(2Ã—1)+2=4
(4Ã—2)+3=11
(11Ã—3)+4=37
(37Ã—4)+5=153
(153Ã—5)+6=771
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4).Â 9, 14, 21, 32, 45, ?
Solution: (Difference)
5).Â 3, 10, 22, 39, 61, ?
Solution:Â (Difference)
6).Â 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) =Â 55
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7).Â 6, 6, 8, 14, 26, ?
Solutions: Difference of Difference â€“ 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) =Â 46
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8).Â 3, 5, 13, 43, 177, ?
Solutions:
3Ã—1+2=5
5Ã—2+3=13
13Ã—3+4=43
43Ã—4+5=177
177Ã—5+6=891
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9).Â 4, 2, 2, 3, 6, ?
Solutions:
X0.5, x1, x1.5, x2, x2.5â€¦ =Â 15
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10).Â 3, 9, 22, 42, 69, ?
Solutions : Difference of Difference
3+6 = 9
9+13 (6+7) = 22
22+20 (13+7) = 42
42+27 (20+7) = 69

69+34 (27+7) =Â 103

11).Â 3, 8, 15, 26, 39, ?
Solution: (Difference of prime number)
3+5=8
8+7=15
15+11=26
26+13=39
39+17=56
12).Â 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
13).Â 5, 11, 24, 71, ?
i. 5+6= 11
(6Ã—2+13) = 13 Difference of Difference
ii.Â  11+13= 24
(13Ã—3+23) = 47 Difference of Difference
iii. 24+47= 71
(47Ã—4+33) = 215 Difference of Difference
iv. 71+215=Â 286
14).Â 1, 3, 9, 31, 129, ?
1Ã—1+2, 3Ã—2+3, 9Ã—3+4, 31Ã—4+5, 129Ã—5+6
15).Â 8, 4, 4, 6, 12, ?
8Ã—0.5, 4Ã—1, 4Ã—1.5, 6Ã—2, 12Ã—2.5

16).Â  3, 1.5, 1.5, 2.25, 4.5, ?Â Â Â Â Â
Solutions
Â 3Ã—.5= 1.5
1.5Ã—1=1.5
1.5Ã—1.5=2.25
2.25×2 = 4.5
4.5×2.5=11.25.
17).Â  2, 4, 11, 37, 153, ?Â Â Â Â Â Â Â Â Â
Solutions
2Ã—1+2= 4
4Ã—2+3= 11
11Ã—3+4= 37
37×4+5 = 153
153×5+6 =Â 771
18).Â  9, 14, 21, 32, 45, ?Â Â Â Â Â Â Â Â Â Â Â
Solutions
Difference of Prime No: 5, 7, 11, 13, 15, 17
19).Â  4, 4, 6, 12, 24, ?
4+0 = 4
4+2 = 6
6+6 = 12
12+12 = 24
24+20 =Â 44
diff of diff 2, 4, 6, 8
20).Â Â 4, 3, 4.5, 8.75, 20, ? .Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
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 =Â 53
21).Â 6, 4, 5, 11, 39, ?
Solution:
6Ã—1-2=4, 4Ã—2-3=5, 5Ã—3-4=11, 11Ã—4-5=39, 39Ã—5-6=189
22).Â 14, 7, 7, 14, 56, ?
Solution:
14Ã—0.5=7, 7Ã—1=7, 7Ã—2=14, 14Ã—4=56, 56Ã—8=448
23).Â 2, 3, 7, 16, 32, ?
Solution:
2+12=3, 3+22=7, 7+32=16, 16+42=32, 32+52=57
24).Â 8, 14, 24, 38, 56, ?Â
Difference of Difference 4, 4, 4, 4, 4,4
25).Â 5, 7, 13, 25, 45, ?

Difference of Difference 4, 6, 8, 10.

26).Â 12, 6, 12, 48 ?
Solution:
12Ã·2 = 6
6x 2= 12
12 x 4 = 48

48 x 8 =Â 384

27).Â 4, 5, 9, 18, 34, 59, ?
Solution:
DifferenceÂ +12,Â Â + 22, + 32

28).Â 14, 24, 38, 56, 78 ?
Solution:
Difference of Difference 4, 4, 4, 4
29).Â 8, 6, 9, 23, 87 ?Â
Difference x1-2, x2-3, x3-4…
30).Â 12.5, 14.5, 18.5, 24.5, ?

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

31).Â 4, 16, 26, 34, 40, ?
Solution:
Difference of 12,10,8,6, ….
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32).Â 825, 582, 501, 474, 465, ?
Difference of 35,34,33,32,Â 31
Â
33).Â 8, 12, 24, 60, 180, ?
Ã—1.5, Ã—2, Ã—2.5, Ã—3, Ã—3.5
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34).Â 3, 4, 10, 33, 136, ?
Solution:
3Ã—1+1, 4Ã—2+2, 10Ã—3+3, 33Ã—4+4, 136Ã—5+5
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35).Â 16, 17, 13, 22, 6, ?
Solution:
Difference= +12, -22, +32, -42, +52

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

Solutions:
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 =Â 3037).Â Diif of DiffÂ 7, 7, 7, 7,7
157-7=150
150-14=136
136-21=115
115-28= 87
87-35 =Â 5238).Diff of Diff = 11, 12, 13, 14
1 +3Â = 4Â  Diff (11)
4 +Â 14Â = 18Â Â Diff (12)
18 + 26Â = 44Â Â Diff (13)
44Â + 39 = 83Â Â Diff (14)
83Â + 53 =Â 13639).
1x 2 = 2
2x 4 = 8
8x 6 = 48
48x 8 =Â 384

40).Â 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: Ã—2, Ã—4, Ã—6, Ã—8, Ã—10
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42).2, 4, 17, 42, 80
Sol: Difference of Difference 11, 12, 13, 14
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43). 11, 12, 16, 25, 41
Sol: Difference +12, 22, 32, 42, 52
Â
44).116, 160, 148, 130, 106
Sol:Â Difference of Difference -6, -6, -6, -6
Â

50). Logic-Â Ã—0.5,Â Ã—1,Â Ã—1.5,Â Ã—2..

51). 1,Â Â  4,Â Â  24,Â Â  60,Â Â  111,Â Â  ?
Logic: Difference of Difference (+17, +16, +15, +14)
52).192,Â Â  ?Â Â  48,Â Â  24,Â Â  12,Â Â  6
Solution:
192/2=96
96/2=48
48/2=24
24/2=12
12/2=6
53). 5,Â Â  14,Â Â  39,Â Â  88,Â Â  169,Â Â  ?
Logic: Difference of 32, 52, 72, 92, 112
54). 12,Â Â Â  12,Â Â  24,Â Â  72,Â Â  288,Â Â  ?
Solution:
12×1=12
12×2=24
24×3=72
72×4=288
288×5=1440
55). 307,Â Â  300,Â Â  286,Â Â  258,Â Â  202, ?
Logic: Difference of (-7, -14, -28, -56, -112)

56). 4Â Â  13Â Â  38Â Â  87Â Â  168Â Â  ?
Logic: Difference of Difference (+32, +52, +72, +92, 112)
Â
57).224Â Â  ?Â Â  56Â Â  28Â Â  14
224/2=112
112/2=56
56/2=28
28/2=14
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58). 2Â Â  4Â Â  23Â Â  58Â Â  108Â Â  ?
Logic: Difference 2, 19, 35, 50, 64
Difference of Difference (+17, +16, +15, +14)
Â
59). 11Â Â  11Â Â  22Â Â  66Â Â  264Â Â  ?
11×1=11
11×2=22
22×3=66
66×4=264
264×5 =Â 1320
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60).216Â Â  210Â Â  198Â Â  174Â Â  126Â Â  ?
Logic: Difference 6, 12, 24, 48, 96
Differece of Differece 6 x 21, 6×22, 6×23, 6×24

61).10, 12, 16, 24, 40, ?
Logic: Difference of: 2, 4, 8, 16, 32â€¦
62). 402, 400, 394, 376, 322, ?
Logic: Difference Ã— 3, Difference Ã— 3, Difference Ã— 3..
63). 1, 3, 15, 105, ?
Sol- 1Ã—3=3
3Ã—5=15
15Ã—7=105
105Ã—9= 945
64). 8, 28, 46, 61, 72, ?
Logic: Difference of Difference 2, 3, 4, 5â€¦
65). 120, 24, 6, 2, ?, 1
Sol: 120Ã·5=24
24Ã·4=6
6Ã·3=2
2Ã·2=1
1Ã·1=1