Series - Find Missing Number

1. Insert the missing number. 12, 25, 49, 99, 197, 395, (...)
A. 789	B. 1579
C. 722	D. 812

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Here is the answer and explanation

Answer : Option A

Explanation :

Each number is twice the previous one with 1 added or subtracted alternatively.

2.Insert the missing number. 34, 7, 37, 14, 40, 28, 43, (...)
A. 31	B. 42
C. 46	D. 56

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Here is the answer and explanation

Answer : Option D

Explanation :

We have two series here

34, 37, 40, 43, ... (Increase by 3)
7, 14, 28, ... (Multiply by 2)

Hence, next term is 28 × 2 = 56

3. Find the missing number. 1, 4, 9, 16, 25, 36, 49, (....)
A. 64	B. 54
C. 56	D. 81

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Here is the answer and explanation

Answer : Option A

Explanation :

The series is 1², 2², 3², 4², 5², 6², 7², ...

Hence, next term = 8² = 64

4. Insert the missing number. 2, 7, 10, 22, 18, 37, 26
A. 42	B. 52
C. 46	D. 62

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Here is the answer and explanation

Answer : Option B

Explanation :

There are two series here

2, 10, 18, 26, ... (Increase by 8)
7, 22, 37, ... (Increase by 15)

Hence, next term is 37+15 = 52

5. 4, 12, 48, 240, 1440, (...)
A. 7620	B. 10080
C. 6200	D. 10020

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Here is the answer and explanation

Answer : Option B

Explanation :

Go on multiplying the given numbers by 3, 4, 5, 6, 7

6. 2, 3, 6, 0, 10, -3, 14, (...)
A. 6	B. 2
C. -2	D. -6

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Here is the answer and explanation

Answer : Option D

Explanation :

There are two series

2, 6, 10, 14, ... (Adding 4)
3, 0, -3, ... (Subtracting 3)

Hence, next term is -3 - 3 = -6

7. 5, 10, 13, 26, 29, 58, 61, (....)
A. 128	B. 64
C. 125	D. 122

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Here is the answer and explanation

Answer : Option D

Explanation :

Numbers are alternatively multiplied by 2 and increased by 3

5 × 2 = 10
10 + 3 = 13
13 × 2 = 26
26 + 3 = 29
29 × 2 = 58
58 + 3 = 61
61 × 2 = 122

8. 1, 8, 27, 64, 125, 216, (....)
A. 354	B. 392
C. 343	D. 245

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Here is the answer and explanation

Answer : Option C

Explanation :

The pattern is 1³, 2³, 3³, 4³, 5³, 6³, etc

Hence, next number is 7³ = 343

9. 4, 5, 7, 11, 19, (...)
A. 22	B. 35
C. 27	D. 32

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Here is the answer and explanation

Answer : Option B

Explanation :

4
4 × 2 - 3 = 5
5 × 2 - 3 = 7
7 × 2 - 3 = 11
11 × 2 - 3 = 19
19 × 2 - 3 = 35

10. 23, 29, 31, 37, 41, 43, (...)
A. 53	B. 47
C. 48	D. 59

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Here is the answer and explanation

Answer : Option B

Explanation :

All are prime numbers in their order, starting from 23

Hence, next number is 47

11. 8, 24, 12, 36, 18, 54, (....)
A. 27	B. 68
C. 108	D. 72

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Here is the answer and explanation

Answer : Option A

Explanation :

8 × 3 = 24
24 ÷ 2 = 12
12 × 3 = 36
36 ÷ 2 = 18
18 × 3 = 54
54 ÷ 2 = 27

12. 7, 26, 63, 124, 215, 342, (....)
A. 481	B. 391
C. 511	D. 421

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Here is the answer and explanation

Answer : Option C

Explanation :

The series is (2³ - 1), (3³ - 1), (4³ - 1), (5³ - 1), (6³ - 1), (7³ - 1), ...

Hence, next number is (8³ - 1) = 511

13. 2, -6, 18, -54, 162, (...)
A. 486	B. -486
C. 422	D. -428

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Here is the answer and explanation

Answer : Option B

Explanation :

2 × -3 = -6
-6 × -3 = 18
18 × -3 = -54
-54 × -3 = 162
162 × -3 = -486

14. 2, 6, 12, 20, 30, 42, 56, (...)
A. 61	B. 72
C. 64	D. 70

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Here is the answer and explanation

Answer : Option B

Explanation :

The pattern is 1×2, 2×3, 3×4, 4×5, 5×6, 6×7, 7×8.

Hence, next number is 8×9 = 72

15. 8, 12, 18, 27, 40.5, (...)
A. 60.75	B. 62
C. 58	D. 60.5

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Here is the answer and explanation

Answer : Option A

Explanation :

8
(8×3)÷ 2 = 12
(12×3)÷ 2 = 18
(18×3)÷ 2 = 27
(27×3)÷ 2 = 40.5
(40.5×3)÷ 2 = 60.75

16. 196, 144, 100, 64, 36, ?
A. 16	B. 8
C. 18	D. 12

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Here is the answer and explanation

Answer : Option A

Explanation :

The patter is 14², 12², 10², 8², 6², ...

So next number is 4² = 16

17. 2, 3, 5, 16, 231, ?
A. 62005	B. 52120
C. 422	D. 53105

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Here is the answer and explanation

Answer : Option D

Explanation :

2
3
3² - 2² = 5
5² - 3² = 16
16² - 5² = 231
231² - 16² = 53105

18. 279936, 46656, 7776, 1296, 216, ?
A. 60	B. 46
C. 36	D. 66

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Here is the answer and explanation

Answer : Option C

Explanation :

Go on dividing by 6 to the next number

19. 220, 218, 214, 208, 200, 190, ?
A. 166	B. 178
C. 182	D. 190

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Here is the answer and explanation

Answer : Option B

Explanation :

220
220 - 2 = 218
218 - 4 = 214
214 - 6 = 208
208 - 8 = 200
200 - 10 = 190
190 - 12 = 178

20. 12, 38, 116, 350, 1052, ?
A. 1800	B. 2200
C. 2800	D. 3158

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Here is the answer and explanation

Answer : Option D

Explanation :

12
12 × 3 + 2 = 38
38 × 3 + 2 = 116
116 × 3 + 2 = 350
350 × 3 + 2 = 1052
1052 × 3 + 2 = 3158

21. 9, 35, 91, 189, 341, ?
A. 502	B. 521
C. 559	D. 611

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Here is the answer and explanation

Answer : Option C

Explanation :

1³ + 2³ = 9
2³ + 3³ = 35
3³ + 4³ = 91
4³ + 5³ = 189
5³ + 6³ = 341
6³ + 7³ = 559

22. 78, 64, 48, 30, 10, (...)
A. -12	B. -14
C. 2	D. 8

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Here is the answer and explanation

Answer : Option A

Explanation :

78 - 14 = 64
64 - 16 = 48
48 - 18 = 30
30 - 20 = 10
10 - 22 = -12

23. 16384, 8192, 2048, 256, 16, ?
A. 1	B. 8
C. 2	D. 0.5

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Here is the answer and explanation

Answer : Option D

Explanation :

Terms are continuously divided by 2,4,8,16, and so on

16384
16384 ÷ 2 = 8192
8192 ÷ 4 = 2048
2048 ÷ 8 = 256
256 ÷ 16 = 16
16 ÷ 32 = 0.5

24. 46080, 3840, 384, 48, 8, 2, ?
A. 1	B. ¹⁄₆₄
C. ¹⁄₈	D. None of these

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Here is the answer and explanation

Answer : Option A

Explanation :

46080 ÷ 12 = 3840
3840 ÷ 10 = 384
384 ÷ 8 = 48
48 ÷ 6 = 8
8 ÷ 4 = 2
2 ÷ 2 = 1

25. 7, 21, 63, 189, 567, ?
A. 1521	B. 1609
C. 1307	D. 1701

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Here is the answer and explanation

Answer : Option D

Explanation :

Multiply a term with 3 to get the next term

26. 1, 0.5, 0.25, 0.125, 0.0625, ?
A. 0.015625	B. 0.03125
C. 0.0078125	D. None of these

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Here is the answer and explanation

Answer : Option B

Explanation :

Divide by 2 to get the next term

27. Complete the series 20, 19, 17, ...., 10, 5
A. 15	B. 16
C. 13	D. 14

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Here is the answer and explanation

Answer : Option D

Explanation :

20 - 1 = 19
19 - 2 = 17
17 - 3 = 14
14 - 4 = 10
10 - 5 = 5

28. Which fraction will come next, $MF#%\dfrac{1}{2}, \dfrac{3}{4}, \dfrac{5}{8}, \dfrac{7}{16}, \text{?}$MF#%

A. $MF#%\dfrac{9}{32}$MF#%

B. $MF#%\dfrac{9}{30}$MF#%

C. $MF#%\dfrac{9}{28}$MF#%

D. $MF#%\dfrac{11}{32}$MF#%

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Here is the answer and explanation

Answer : Option A

Explanation :

Numerators are getting increased by 2. i.e., numerators goes like 1,3,5,7,...

Hence, next numerator = 7+2 = 9

Denominators are getting multiplied by 2. i.e., denominators goes like 2,4,8,16,...

Hence, next denominator = 16×2 = 32

$MF#%\text{So, the next fraction is }\dfrac{9}{32}$MF#%

29. 4, 10, (?), 82, 244, 730
A. 26	B. 28
C. 40	D. 48

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Here is the answer and explanation

Answer : Option B

Explanation :

4 × 3 - 2 = 10
10 × 3 - 2 = 28
28 × 3 - 2 = 82
82 × 3 - 2 = 244
244 × 3 - 2 = 730

30. Complete the series 95, 115.5, 138, ..., 189
A. 160.5	B. 162.5
C. 164.5	D. 166.5

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Here is the answer and explanation

Answer : Option B

Explanation :

95 + 20.5 = 115.5
115.5 + 22.5 = 138
138 + 24.5 = 162.5
162.5 + 26.5 = 189

Comments(64) (optional)

showing 1-10 of 64 comments, sorted newest to the oldest

Mohamed

2015-04-08 22:26:26

Missing nummber of 1, 8, 2, 7, 3, 6, 4, .......?

(1)

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Dev

2015-04-09 18:33:35

5

Two series
1 2 3 4
8 7 6 5

(0)

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Victory

2015-04-02 06:18:42

3 5 6 12 ----- 24 26

Missing number for this is 19. Please let me how the answer is 19

(0)

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gaurav

2015-10-02 14:57:10

3 6 12 24 (alternate terms getting doubled)
5 12 19 26 (increased by 7 alternate terms)

(0)

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vishal

2015-04-01 07:34:53

find next term 10,15,23,31,41,?

(0)

(0) Reply

2015-04-14 08:12:28

(0)

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chirag

2015-03-16 11:41:26

18,27,49,84,132..

a) 188

b) 193

c) 168

can nybody tel how the ans wil be 193 ???

(0)

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arnav

2016-08-17 06:37:39

18+9 = 27
27+22(9+13=22) = 49
49+35(22+13) =84
84+48(35+13) = 132
132+61 (48+13) =193

(1)

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saurav

2015-07-10 06:17:57

27-18=9 49-27=22 84-49=35 132-84=48 ?-132=61 ---- ?=61+132=193

22-9=13 35-22=13 48-35=13 61-48=13

(0)

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sakshi sharma

2015-06-15 12:25:19

27-18=9 49-27=22 84-49=35 132-84=48

22-91=13 35-22=13 48-35=13

so, next number will be= 132+ (48+13)= 193

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