Number Series Exercise I - Secretariate Assistant Exam - 2015

Find out the next number in the series

Q1.      4, 9, 16, 25 _? 

Ans:  36
Explanation:
4+5 = 9
9+7 = 16
16+9 = 25 

So the next term will be
25+11= 36

Q2.      9, 7, 10, 8, 11, 9, _?


Ans: 12
Explanation:
9 - 2 =7
7 + 3 = 10
10 - 2 = 8
8 + 3 = 11
11 - 2 =  9

So the next term will be
9 + 3 = 12

Q3.      36, 34, 30, 28, 24, _?


Ans: 22
Explanation:
36 - 2 = 34
34 - 4 = 30
30 - 2 = 28
28 - 4 =24

So the next term will be
24 - 2 =  22

Q4.      20, 19, 17,_? , 10, 5  


Ans:14
Explanation:
20 - 1 = 19
19 - 2 =17

So the next term will be
 17 - 3 =14

Q5.      3, 4, 8, 17, 33 _? 


Ans: 58
Explanation:
3 + 1x1 = 34
4 + 2x2 = 8
8 + 3x3 = 17
17 + 4x4 = 33

So the next term will be
33 + 5x5 = 58

Q6.      6, 11, 21, 36, 56,_? 

Ans: 81

Q7.      1, 6, 13, 22, 33,_? 

Ans: 46

Q8.      3, 9, 27, 81,_? 

Ans: 243

Q9.      5,6,7,9,9,12,_?

Ans:11 

Q10.  1,3,5,6,9,10,_?

Ans: 13

If you want anymore explanations feel free to comment. Thank you