Easy and best way to understand series completion with examples

This section will help you to learn about the Verbal reasoning aptitude called ‘Series Completion.’ In the view of competitive exams, Series Completion is an important part of verbal reasoning.

Verbal reasoning based Series Completion questions and answers are all frequently asked in competitive exams like CAT, GATE, GRE, MAT, Bank Exam, Railway Exam, Entrance exams, or any other exams.

Series Completion based questions and answers are very easy to do and hence it helps in scoring good marks.

While writing any kind of competitive exams, time management is very important. So practice time management to answer questions properly.

What is Series Completion?

In questions of series completion, a pattern of number, letters or both together will be given in a particular sequence with some missing terms.

Candidates have to identify the pattern of the series and have to choose the answer from the given options.

There are three types of series.

They are:

  1. Numeric series
  2. Alphabetical series
  3. Alphanumeric series

Numeric series consists of numbers in a particular pattern with some missing terms.

Alphabetical series consists of alphabets with some missing terms. In this type of questions, a single alphabet or a group of alphabets may be given. Candidates must understand the analogy of the given alphabets and then have to solve it.

Alphanumeric series consists of both numbers and alphabets that are shuffled and given with missing terms.

Tips and tricks of series completion

In numeric series, the first thing you have to do is to analyse the given series is in ascending or descending order. If it is ascending then the number series are in addition or multiplication pattern. If it is descending order, then the number series are in subtraction or division pattern.

If the numbers are neither ascending nor descending then alternate numbers should have the same pattern. So identify carefully.
While solving the Alphabetical series, you have to use the same rule as the numeric series.

In the alphanumeric series, understanding how the number and alphabets are shuffled. Know the analogy of each number listed.
Know the square and cubic value of number from 1 to 25 to solve easily.


Complete the series: 12, 15, 21, 33, 57, ____

  1. 105
  2. 95
  3. 62
  4. 65

The answer is option (a). The series is in ascending order and so it is either addition or multiplication. The given series is addition by adding in the pattern, +3, +6, +12, +24, so the next number is 57+24 = 105.

Practicing will make everyone an expert. So practice daily, do online tests and score high marks in your exams.