Video Lesson on Series

Verbal reasoning forms an essential part of a number of exams. Various types of questions are asked in this section. One of these is the ‘logical sequence of words’. In this article, we will discuss the concept and tricks to tackle the related questions.

In this topic, Continuous literals will be given, and we have to find out missing or next literal of given problem.

Alphanumeric (sometimes shortened to alphameric) is a combination of alphabetic and numeric characters. In some cases, it may include upper and lower case letters, punctuation marks, and symbols (such as @, &, and *,).

This type of reasoning is a mixed bag of coding-decoding, series-based reasoning and finding positions based reasoning questions.

Note: Literals can be numbers, symbols and alphabet.


Squares, cubes up to 30 will be required for easy and quick solution of problem. Numeric position of alphabet is required for alphabet based series. It is necessary to have knowledge about prime and composite numbers, Fibonacci series and factorial of a number. It is mandatory, because problems can be based on any of the above concepts.


The mere fact that there are infinite ways to solve them makes these questions a tough nut to crack. It is not possible to guess the way the numbers are arranged in your first attempt. You will need to try the same question multiple times and calculate at lightning fast speed.

  • i) Draw basic chart of alphabet having letters and their numerical position.
    Note: Write reverse numbers also i.e. a-26, b-25, c-24 …up to a-1 or use another approach of writing letters and their numerical position by multiplication of 5.
  • ii) Addition of a letter’s numerical position from ascending and descending order is 27.
    E.g.: A-1-26 (1+26=27),
    B-2-25 (2+25=27) .....
    Y-25-2 (25+2=27)
    Z-26-1 (26+1=27)
  • iii) Use pyramid approach if you are not getting any series even after single iteration. E.g.:
    Diagram of Pyramid based problem.
Section MCQ Full Section (3 MCQ)
Topic Para Based MCQ
Topic Questions with Answers

Types of questions

There are basically 3 major types of problems asked.

A) Numerical

In this type of problems series of numeric are given and in series, there must be some sort of relation or logic exists. We have to find out the relation as well as logic amongst given series.

Logic might be of:

  • i) Addition or Subtraction - In addition or Subtraction, the difference between two numbers is small. This logic comes under Arithmetic Progression(AP)
  • ii) Multiplication or Division - If the relationship between two numeric is of Multiplication or Division, then the difference is High. This logic comes under Geometric Progression(GP)
  • iii) Squares or Cubes - If it is Squares or Cubes, then difference is too High
  • iv) Prime or Composite numbers - Series are provided with prime numbers or composite numbers also. i.e. 2, 3, 5, 7, 11, 13 are prime number while 4, 6, 8, 9, 10, 12 are composite numbers
  • v) Factorial or Fibonacci - Problems are asked based on factorial of a number or from a Fibonacci series
  • vi) Other miscellaneous types - In this type of problems, it can have some observation type of logic. We can’t apply some addition, subtraction or any arithmetic operation directly. We have to observe the given problem and then we can get some solution like, breaking down each number or reversing each number from series

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