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 :-
So,46 is replaced by 53.
- Pure Series
- Difference Series
- Ratio Series
- Mixed Series
- Geometric Series
- Two Tier Arithmetic Series
- Other Type
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
121, 144, 169, 225 ?
Answer - 256
- Perfect Cube
6859, 5832, 4913, 4096, 3375, ?
Answer - 2744
2. Difference Series
1348, 1338, 1318, 1288, 1248, ?
Answer - 1198
3. Ratio Series
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, ?
6. Two-tier Arithmetic Series
7. 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
So, 440 is replaced by 446
- 5, 6, 14, 40, 89, 170, 291
So, 14 is replaced by 15.
- 445, 221, 109, 46, 25, 114, 4
So,46 is replaced by 53.
- 12, 26, 56, 116, 244, 498, 1008
So, 116 is replaced by 118
- 8, 27, 64, 125, 217, 343
So, 217 is replaced by 216
I have made a video tutorial for this chapter here.
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