Series

Question 1

What will be the next number? 3, 5, 7, 11, 13, 17…….

Cross

21

Tick

19

Cross

25

Cross

20



Question 1-Explanation: 

This is a sequence of prime numbers.

Question 2

Find wrong number in series:
12, 25, 49, 99, 187, 395, 789

Cross

789

Tick

187

Cross

99

Cross

49



Question 2-Explanation: 

12*2+1 =25
25*2-1 = 49
49*2+1 = 99

99*2-1=197

197*2+1=395
395*2-1 = 789

Question 3
Find wrong number in series:
34, 7, 37, 14, 36, 28, 43, 56
Cross
14
Tick
36
Cross
28
Cross
56


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
Cross
9
Cross
25
Tick
32
Cross
64


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
Cross
10
Cross
18
Cross
26
Tick
46


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
Cross
12
Cross
240
Tick
1240
Cross
10080


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
Cross
3
Cross
0
Tick
8
Cross
3


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
Cross
1
Cross
27
Tick
81
Cross
343


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

Tick

12

Cross

19

Cross

35

Cross

7



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
Cross
29
Tick
33
Cross
41
Cross
47


Question 10-Explanation: 
prime numbers from 23
There are 18 questions to complete.

  • Last Updated : 27 Sep, 2023

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