Number Series Questions For SBI PO 2021
Number Series is a very important part of quantitative aptitude and is usually asked in all banking exams. In banking exams, it covers 4 to 5 questions which may play a very important role in selection. So, students should aware of all types of patterns of number series asked in exams and should practice more and more on the number series. Here, we are providing some important notes and tricks for the number series which will be helpful in your preparation.
Type of Number Series Asked in Banking PO Examination
In banking exams, generally, two types of number series are asked.
The first one is the Missing Number Series in which some numbers are given which are following a certain pattern. The student is expected to find out the missing number.
The second one is the Wrong Number Series in which some numbers are given but one number is wrong and does not follow the required pattern. The student is expected to find out the wrong number.
Types Of Number Series Asked in Competitive Exam
1. Addition and Subtraction Series.
In this type of series, the series is either increasing by adding a common number in it or it is decreasing by subtracting a common number in it.
For example: 4, 8, 12, 16, 20
the difference between the two successive numbers is 4 hence you can understand that 4 is added in each number.
Similarly for Subtraction:
36, 30, 24, 18, 12. In this series, the difference between the two numbers is 6 and hence you can understand that the pattern followed in this number series is the subtraction of 6 in each subsequent number.
2. Multiplication and Division Series
In multiplication series, the numbers are increasing but in a more rapid way for ex: 5, 25, 125, 625 so, here you can see that the series is increasing rapidly and if you will see then each increasing number is getting multiplied by 5 to get the next number. This is the approach you use to solve these types of questions.
*One of the best way to know the number which is getting multiplied is to divide the highest number with second-highest number of the series.
Same procedure is followed by the Division series. The only difference is that the series gets decreases subsequently.
3. Square and Cube Series.
In these type of questions, your pre-acquired knowledge of cube and square will come handy and will be useful. For example- 8 27 125 512 1331 2197
As you can see that 23=8, 33=27, 53=125,
then the next number which will follow the series is cube of 7 which is 343.
4. Mix Pattern Series.
In this type of series, the pattern is increasing in a mixed way which means that some number is getting multiplied along with the addition of a number. For example- 5, 6, 13, 40, the pattern followed in this series is as given below:
Previous Year Asked Number Series Questions in SBI PO
Directions (1-5): What will come in place of (?) in the following number series problems?
1). 200, 197, 185, 163, 130, ?
2). 15, 8, 9, 15, 32, ?
3). 5, 30, 150, 600, ?
4). 222, 110, 54, 26, ?
5). 104, ?, 96, 120, 88, 128
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