Number Series Rules with solved

Number Series 

Rules with solved

Aptitude Notes

Mr RBPS Exam,

Dear Readers,

Since many Banking exams are in the streak and Maths section is like to be out of depth for many Aspirants. Here we are sharing Rules pertained to Number Series which is prepared and provided by one of our Ardent Readers Stallon. Number series form which at least 4- 5 questions use to come in the Banking Exams. We anticipate these would be viable to all of you.

Number Series 

Rules with solved Problems :

Series is an important chapter from banking examination point of view. Following are some of the important rules or order on which the number series can be made :-
Pure Series
Difference Series
Ratio Series
Mixed Series
Geometric Series
Two Tier Arithmetic Series
Other Types

1. Pure Series

In this type of number series, the number itself obeys certain order so that the character of the series can be found out.
The number itself may be.
 

Perfect Square

Example :
121, 144, 169, 225 ?
Answer - 256
Perfect Cube
Example :
6859, 5832, 4913, 4096, 3375, ?
Answer - 2744

2. Difference Series

Example :
1348, 1338, 1318, 1288, 1248, ?
Answer - 1198

3. Ratio Series

Example :
336, 168, 84, 42, 21, ?
Answer - 10.5

4. Mixed Series

Example :
222, 441, 1321, 2639, 7915, ?
Answer - 15827

5. Geometric Series

Example 1. 5, 35, 245, 1715, ?
Ans. 12005
Examples 2. 43923,3993, 363, 33, ?
Ans. 3

Other Type

To find the odd number from the number series. In this type of series the above rules are also followed.

Some Examples :

 2, 3, 7, 22, 89, 440, 2677, 18740

Solution :

×1+1, ×2+1, ×3+1, ×4+1, ×5+1 ........

So, 440 is replaced by 446

5, 6, 14, 40, 89, 170, 291

Solution : 

+12, +32, +52, +72, +92

So, 14 is replaced by 15.

445, 221, 109, 46, 25, 114, 4

Solution : 

-3÷2, -3÷2........

So,46 is replaced by 53.

12, 26, 56, 116, 244, 498, 1008

Solution : 

×2+2, ×2+4 ×2+6,  ........

So, 116 is replaced by 118

8, 27, 64, 125, 217, 343

Solution : 

23, 33, 43, 53,.....

So, 217 is replaced by 216