12

Series

Question 1
What will be the next number? 3, 5, 7, 11, 13, 17…….
A
21
B
19
C
25
D
20
Arithmetic Aptitude    Series    
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Question 1 Explanation: 
This is a sequence of prime numbers
Question 2
Find wrong number in series:
12, 25, 49, 99, 187, 395, 789
A
789
B
187
C
99
D
49
Series    
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Question 2 Explanation: 
12*2+1 =25
25*2-1 = 49
49*2+1 = 99
395*2-1 = 789
Question 3
Find wrong number in series:
34, 7, 37, 14, 36, 28, 43, 56
A
14
B
36
C
28
D
56
Series    
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Question 3 Explanation: 
mixture of series (alternate numbers)
34+3=37,
37+3 =40...
7*2= 14
14*2= 28
28*2 =56
Question 4
Find wrong number in series:
1, 4, 9, 16, 25, 32, 49, 64
A
9
B
25
C
32
D
64
Series    
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Question 4 Explanation: 
Square of natural numbers:
12=1, 22 =4, 32=9..............82=64
Question 5
Find wrong number in series:
2, 7, 10, 22, 18, 37, 26, 46
A
10
B
18
C
26
D
46
Series    
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Question 5 Explanation: 
two alternate series:
2+8 =10
7+15=22
10+8 =18
22+15=37
37+15 = 52
so, +8, +15, +8, +15, ......
Question 6
Find wrong number in series:
4, 12, 48, 240, 1240, 10080
A
12
B
240
C
1240
D
10080
Series    
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Question 6 Explanation: 
4*3=12
12*4=48
48*5 = 240
240*6 = 1440
Question 7
Find wrong number in series:
2, 3, 6, 0, 8, -3, 14, -6
A
3
B
0
C
8
D
3
Series    
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Question 7 Explanation: 
two alternate series:
2+4 =6,
3-3 =0
6+4 =10,
0-3 =-3
10+4 =14
-3-3 =-6
Question 8
Find wrong number in series:
1, 8, 27, 64, 81, 216, 343
A
1
B
27
C
81
D
343
Series    
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Question 8 Explanation: 
cubes of natural numbers
81 is not the cube of desired number
Question 9
Find wrong number in series:
4, 5, 7, 12, 19, 35
A
12
B
19
C
35
Series    
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Question 9 Explanation: 
4+20=5
5+21=7
7+22=11
11+23=19
19+24=35
Question 10
Find wrong number in series:
23, 29, 31, 33, 41, 43, 47
A
29
B
33
C
41
D
47
Series    
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Question 10 Explanation: 
prime numbers from 23
There are 16 questions to complete.
12

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