Number Series Notes - 2 CAT Notes | EduRev

CAT : Number Series Notes - 2 CAT Notes | EduRev

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Type 3 - Factorisation / Prime Factorisation

If Type 1 and Type 2 is not applicable in a sequence, one must try to make factors of the numbers in the next step.

Example 1: 6, 15,35,77,143, __.
In the above example all the previous tricks are not applicable to get answer. Hence, We will make factors of the given numbers
Number Series Notes - 2 CAT Notes | EduRev
(2,3,5,7,11,13) all are prime numbers in ascending order.
Hence, 13*17 = 221, is the correct answer.

Try yourself:Next number in series 31, 41, 47, 59, __?
View Solution

Type 4 - Fibonacci Series

A series in which a number is made by using previous two numbers is called Fibonacci series.

Example : 1, 4, 5, 9, 14, 23, ___
In the above sequence all the numbers are sum of previous two numbers.
Therefore, 23+14 = 37, is the correct answer.

Type 5 – Sum of Digits

Example 1:
Number Series Notes - 2 CAT Notes | EduRev
In the above sequence, difference between two numbers is the sum of digits of the first number.
Hence, 89 + 17 = 106, is the correct answer.

Example 2:
Number Series Notes - 2 CAT Notes | EduRev
All the numbers are multiplied by their sum or added by their sum alternately. Therefore, 11788 + 25 = 11813, is the correct answer.

Type 6 – Alternate Pattern Series

When numbers given as a hint in a questions are more or when a question ask two numbers of a series or same number come twice in a series, these all give hint to alternate pattern series.
Example 1:
Number Series Notes - 2 CAT Notes | EduRev
So, numbers are 12 + 5 = 17, 53 - 6 = 47
Ans. 17,47

Example 2:
Number Series Notes - 2 CAT Notes | EduRev
So, the number is 24 + 3 = 27
Ans. 27

Try yourself:In the given series, a number is missing. The same number is present in the options below. 

32, 40, 24, 16, 24, __

Select the missing number.

View Solution

Type 7 - Decimal Pattern Series

When the numbers of the sequence are given in the decimal form is decimal pattern series.
Example 1:
Number Series Notes - 2 CAT Notes | EduRev
So, the answer is 18*.8 = 14.4

Example 2:  16, 24, 60, 210, 945, __
The pattern is:
16*1.5 = 24
24*2.5 =60
60*3.5 = 210
210*4.5 = 945
945*5.5 = 5197.5

Type 8 - Bracket Pattern Series

While using bracket pattern we multiply first outside and either add or sub based on given no.

Example 1: 3, 28, 180,  ____,  3676
The pattern is : (3+1)*7 = 28
(28 + 2)*6 =180
(180 + 3)*5 = 915
(915 + 4)*4 = 3676
Ans. 915

Example 2: 37, 31, 52, 144, __, 2810 
The pattern is:
(37 - 6)*1 = 31
(31 - 5)*2 = 52
(52 - 4)*3 = 144
(144 - 3)*4 = 564
(564 - 2)*5 = 2810
Ans. 564

Type 9 - Dual Pattern Series

Example:
15,  9, 8, 12, 36, 170
19,  a, b, __,  d, e

The pattern is:
(15 - 6)*1 = 9
(9 - 5)*2 = 8
(8 - 4)*3 = 12
Similarly:
(19 - 6)*1 = 13
(13 - 5)*2 = 16
(16 - 4)*3 = 36
Ans. 36

Type 10 - Factorial Based Series

This is latest pattern question asked in latest exams
Example 1:
Number Series Notes - 2 CAT Notes | EduRev
Ans. 33

Example 2:
Number Series Notes - 2 CAT Notes | EduRev
Ans. 606 + 721 = 1327


Try yourself:In the given series, only one number is wrong.

3, 9, 19, 32

Find out the wrong number.

View Solution

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