0
920

# Number Series Tricks For IBPS PO Examination | How To Solve Number Series

Questions on number series are common in most of the competitive Exams. General these questions are based on numerical sequences that follow some logical rules based on arithmetic concepts.

One specific series is given based on that analyse the pattern of the series. Then find the next number in sequence based on the same rule.

### Generally, there are 3 types of questions asked from the number series:

1. A number series is given in which a number is wrongly placed. You find the wrong number

Eg:) 216 163 120 72 24

a)216  b)163  c)72 d)24

Logic: 24*1=24

24*3=72

24*5=120

24*7=168

24*9=216

1. A numerical series is given Which a number is missing. You find out the missing number.

Eg:) 31, 37, 41, 43, 47, 51, 53

a) 53   b) 51   c) 47  d) 43

1. A complete numerical series followed by incomplete numerical series. You need to solve the incomplete series in the same pattern in which the given complete numerical series.

Eg:) 9  11  13  15  17

2   4   6    8    ?

Logic : 9*1+2=11

11*1+2=13

13*1+2=15

Same way: 2*1+2=4

4*1+2=6

6*1+2=8

8*1+2=10

## Different Type Of Number Series Important Rules

1. ) Series consist of perfect square
eg:) 2  6  15  31  56  (?)
a) 85    b)89     c)92    d)  81

Logic: difference between the two numbers is perfect square. this is the example of missing number series
6-2=4=2*2

15-6=9=3*3

31-15=4*4

1. ) Series consist of cube addition and subtraction

179, 180, 172, 199, 135    (?)

1. a) 236    b) 272    c) 240   d) 256   e) 260

Logic: 180-179= +(1*1*1)

180-172= -(2*2*2)

199-172= +(3*3*3)

3.) Series consist of Perfect cube

1   9  36  100   (?)

a) 265   b)250   c)245   d)225

Logic: 9-1=(2*2*2)

36-9=(3*3*3)

100-36=(4*4*4)

225=(225-100)=125=(5*5*5)

4.) Alternate series

11  1   13  3   17  ?

a) 6   b)5    c)7    d)9

logic: alternate number with prime numbers

Series of alternate prime numbers:

1   3  5  7

11 13 17 19

1   5  9  13  ( ? )
a)18  b)21  c) 25  d)17

Logic : difference between the numbers is “+4”

6.) Subtraction number series

100  90  80  70  ( ? )
a)60  b)30   c)40  d)50

Logic: difference between the series is “-10”

7.) Multiple number series

1    2   8   64   (?)

A)1124    b)1024   c)1056    d)1058

Logic:  1*2=2

2*4=8

8*8=64

64*16=1024

8.) Division number series

100  50   25  12.5  (?)

Logic: 100/2=50

50/2= 25

25/2=12.5

12.5/2=6.25

9.)Geometric number series

5   45  405    (?)

A)33805    b)3564   c)33758  d)33804

Logic: each number multiple by “9”

5*9=45

45*9=405

405*9=3645

3645*9=33805

10.) Series consisting of primary numbers

22     33   46   63   (?)

A)84   b)82    c)86    d) 89

22+11=33

33+13=46

46+17=63

63+19=82

11.) Mixed Series

1   4   10  22  (?)

A)44   b)45   c)46  d)47

Logic: *2+2

1*2+2=4

4*2+2=10

10*2+2=22

22*2+2=46