Number Series Questions Asked in SBI Clerk Pre 2016

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Number Series Questions Asked in SBI Clerk Pre 2016

Direction: What should come at the place of Question mark(?) in the following Questions:

Q.1 4, 3, 5, 14, 55 , ?

(A) 64

(B) 254

(C) 274

(D) 294

(E) None of these

 

Q.2 2160, ?, 72, 18, 6, 3

(A) 364

(B) 450

(C) 540

(D) 360

(E) 520

 

Q.3 24, ?, 44, 80, 144, 244

(A) 28

(B) 30

(C) 35

(D) 45

(E) 29

 

Q.4 6, 3, 3, 4.5, 9, ?

(A) 52.2

(B) 25.2

(C) 22.5

(D) 52.5

(E) None of these

 

Q.5 16, 13.9, 18.1, 11.8, ?, 9.7

(A) 28.2

(B) 32.2

(C) 10.2

(D) 20.2

(E) 6.4

 

Q.6 9, 11, 16, 26, ?, 69

(A) 65

(B) 49

(C) 43

(D) 32

(E) 51

 

Q.7 3, 4, 10, 33, 136, ?

(A) 725

(B) 685

(C) 856

(D) 525

(E) None of these

 

Q.8 21, 24, 32, 45, 63, ?

(A) 56

(B) 76

(C) 86

(D) 116

(E) 106

 

Q.9 6, 3, 3, 6, 24, ?

(A) 215

(B) 48

(C) 124

(D) 96

(E) 192

 

Q.10 7, 10, 16, 28, ?, 100

(A) 32

(B) 52

(C) 56

(D) 66

(E) 72

 

Q.11 142, 70, 34, 16, ?, 2.5

(A) 11

(B) 9

(C) 7

(D) 4

(E) 12.5

 

Q.12 17, 9, 10, 16.5, 35, ?

(A) 55

(B) 68

(C) 88

(D) 90

(E) None of these

 

Q.13 89, 86, 78, 63, 39, ?

(A) 22

(B) 6

(C) 12

(D) 18

(E) None of these

 

Q.14 5760, ?, 1440, 160, 10, 0.4

(A) 5480

(B) 4560

(C) 5760

(D) 3230

(E) None of these

 

Q.15 8, 5, 6, 10, 21, ?

(A) 36.2

(B) 53.5

(C) 39.2

(D) 65.5

(E) 48

 

Q.16 339, ?, 345, 353, 369, 401

(A) 341

(B) 348

(C) 340

(D) 345

(E) 343

 

Q.17 38, ?, 25.2, 18.8, 22, 20.4

(A) 25

(B) 15.5

(C) 10

(D) 12.4

(E) None of these

 

Q.18 9, 31.4, 20.2, 25.8, 23, ?

(A) 24.4

(B) 30

(C) 36.6

(D) 39

(E) 45

 

Q.19 10, 6, 7, 11.5, 24, ?

(A) 56

(B) 61

(C) 32

(D) 43

(E) 30

 

Q.20 2880, ?, 720, 80, 5, 0.2

(A) 2880

(B) 1440

(C)  1500

(D) 1820

(E) None of these

 

Q.21 259, ?, 253, 245, 229, 197

(A) 258

(B) 256

(C) 257

(D) 255

(E) 254

 

Q.22 1440, ?, 48, 12, 4, 2

(A) 240

(B) 120

(C) 36

(D) 720

(E) None of these

 

Q.23 22, 19.7, 24.3, 17.4, ?, 15.1

(A) 20.5

(B) 25.8

(C) 27.2

(D) 32.6

(E) None of these

 

Q.24 5, 4, 7, 20, 79, ?

(A) 380

(B) 280

(C) 394

(D) 172

(E) None of these

 

Q.25 8, 4, 4, 6, 12, ?

(A) 18

(B) 30

(C) 16

(D) 20

(E) 26

 

Answer 1. (C) 274

Explanation:

Pattern Series
4 4
4 × 1 – 1 3
3 × 2 – 1 5
5 × 3 – 1 14
14 × 4 – 1 55
55 × 5 – 1 274 (✓)

 

Answer 2. (D) 360

Explanation:

Pattern Series
2160 2160
2160 ÷ 6 360 (✓)
360 ÷ 5 72
72 ÷ 4 18
18 ÷ 3 6
6 ÷ 2 3

 

Answer 3. (A) 28

Explanation:

Pattern Series
24 24
24 + 22 28 (✓)
28 + 42 44
44 + 62 80
80 + 82 144
144 + 102 244

 

Answer 4. (E) None of these

Explanation:

Pattern Series
6 6
6 × 0.5 3
3 × 1 3
3 × 1.5 4.5
4.5 × 2 9
9 × 2.5 22.5 (✓)

 

Answer 5. (D) 20.2

Explanation:

In this series there are two number series,

I. 16, 18.1, ?

16 + 2.1 = 18.1

18.1 + 2.1 = 20.2

 

II. 13.9, 11.8, 9.7

13.9 – 2.1 = 11.8

11.8 – 2.1 = 9.7

 

Answer 6. (C) 43

Explanation:

Pattern Series
9 9
9 + 12 + 1 11
11 + 22 + 1 16
16 + 32 + 1 26
26 + 42 + 1 43 (✓)
43 + 52 + 1 69

 

Answer 7. (B) 685

Explanation:

Pattern Series
3 3
3 × 1 + 1 4
4 × 2 + 2 10
10 × 3 + 3 33
33 × 4 + 4 136
136 × 5 + 5 685 (✓)

 

Answer 8. (C) 86

Explanation:

Series : 21 24 32 45 63 86
Pattern : +3 +8 +13 +18 +23
+5 +5 +5 +5

 

Answer 9. (E) 192

Explanation:

Pattern Series
6 6
6 × 0.5 3
3 × 1 3
3 × 2 6
6 × 4 24
24 × 8 192 (✓)

 

Answer 10. (B) 52

Explanation:

Series : 7 10 16 28 52 192
Pattern : +3 +6 +12 +24 +48
×2 ×2 ×2 ×2

 

Answer 11. (C) 7

Explanation:

Pattern Series
142 142
142 × 0.5 – 1 70
70 × 0.5 – 1 34
34 × 0.5 – 1 16
16 × 0.5 – 1 7 (✓)
7 × 0.5 – 1 2.5

 

Answer 12. (D) 90

Explanation:

Pattern Series
17 17
17 × 0.5 + 0.5 9
9 × 1 + 1 10
10 × 1.5 + 1.5 16.5
16.5 × 2 + 2 35
35 × 2.5 + 2.5 90 (✓)

 

Answer 13. (E) None of these

Explanation:

Series : 89 86 78 63 39 4
Pattern : −3 −8 −15 −24 −35
−5 −7 −9 −11

 

Answer 14. (C) 5760

Explanation:

Pattern Series
5760 5760
5760 ÷ 12 5760 (✓)
5760 ÷ 22 1440
1440 ÷ 32 160
160 ÷ 42 10
10 ÷ 52 0.4

 

Answer 15. (B) 53.5

Explanation:

Pattern Series
8 8
8 × 0.5 + 1 5
5 × 1 + 1 6
6 × 1.5 + 1 10
10 × 2 + 1 21
21 × 2.5 + 1 53.5 (✓)

 

Answer 16. (A) 341

Explanation:

Pattern Series
339 339
339 + 21 341 (✓)
341 + 22 345
345 + 23 353
353 + 24 369
369 + 25 401

 

Answer 17. (D) 12.4

Explanation:

Series : 38 12.4 25.2 18.8 22 20.4
Pattern : –25.6 +12.8 –6.4 +3.2 –1.6
÷2 ÷2 ÷2 ÷2

 

Answer 18. (A) 24.4

Explanation:

Series : 9 31.4 20.2 25.8 23 24.4
Pattern : +22.4 –11.2 +5.6 –2.8 +1.4
÷2 ÷2 ÷2 ÷2

 

Answer 19. (B) 61

Explanation:

Pattern Series
10 10
10 × 0.5 + 1 6
6 × 1 + 1 7
7 × 1.5 + 1 11.5
11.5 × 2 + 1 24
24 × 2.5 + 1 61 (✓)

 

Answer 20. (A) 2880

Explanation: 

Pattern Series
2880 2880
2880 ÷ 11 2880 (✓)
2880 ÷ 22 720
720 ÷ 32 80
80 ÷ 42 5
5 ÷ 52 0.2

 

Answer 21. (C) 257

Explanation:

Series : 259 257 253 245 229 197
Pattern : –2 –4 –8 –16 –32
×2 ×2 ×2 ×2

 

Answer 22. (A) 240

Explanation:

Pattern Series
1440 1440
1440 ÷ 6 240 (✓)
240 ÷ 5 48
48 ÷ 4 12
12 ÷ 3 4
4 ÷ 2 2

 

Answer 23. (E) None of these

Explanation:

In this series there are two number series,

I. 22, 24.3, ?

22 + 2.3 = 24.3

24.3 + 2.3 = 26.6

 

II. 19.7, 17.4, 15.1

19.7 – 2.3 = 17.4

17.4 – 2.3 = 15.1

 

Answer 24. (C) 394

Explanation:

Pattern Series
5 5
5 × 1 – 1 4
4 × 2 – 1 7
7 × 3 – 1 20
20 × 4 – 1 79
79 × 5 – 1 394 (✓)

 

Answer 25. (B) 30

Explanation:

Pattern Series
8 8
8 × 0.5 4
4 × 1 4
4 × 1.5 6
6 × 2 12
12 × 2.5 30 (✓)