Classical

Number Series - Number series MCQ

26:  

12,32,72,152,(?),632

A.

815

B.

613

C.

515

D.

312

 
 

Option: D

Explanation :

32-12=20,72-32=40,152-72=80 and so on.
It means difference are doubling as 20,40,80,160,320 etc.
it otherwise means the required number will be 152+160=312 and 312+320=632

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27:  

41,14,53,35,73...

A.

72

B.

27

C.

37

D.

13

 
 

Option: C

Explanation :

Evry second number is reverse of the first e.g.41=14,53=35 and 73=37

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28:  

128,64,32...?

A.

16

B.

30

C.

8

D.

4

 
 

Option: A

Explanation :

Each next number is half of the preceding one

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29:  

(?),19,37,61,91,127,169

A.

17

B.

13

C.

11

D.

7

 
 

Option: D

Explanation :

The difference between seventh and sixth is 42,
Difference between sixth and fifth is 36,
Difference between fifth and fourth is 30,
between IVth and IIIrd is 24,
between IIIrd and second is 18.
It menas the difference atr in the increasing order of 12,18,24,30,36 and so on and the first term will be 19-12=7

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