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Number Series, Coding and Decoding and Odd Man Out

Series

Objective

After going through this lesson, you shall be able to understand the following concepts.

• Concept of Series
• Different types of Series
Introduction

In this lesson, we will study about the series of numbers, series of alphabets or combinations of both, which are generally known as the terms of the series. These terms change in accordance with certain specific rule/order throughout the series. Let us now study the various types of series in detail.

Types of Series

1. Number Series : In these types of questions we have to identify the missing term or wrong term of the series. These terms follow a certain pattern throughout the series.

Example: Find the missing term in the following series.
2, 4, 7, 11, 16, ...

Solution: Here, the given series follows the pattern

So, the missing term is 22.

Example: Find the wrong term of the series 2, 5, 10, 17, 24, 37, 50.

Solution: Here, the given series follows the pattern

 2 5 10 17 24 26 37 50 12 + 1 22 + 1 32 + 1 42 + 1 52 + 1 62 + 1 72 + 1

So, the wrong term of the series is 24.

2. Alphabet Series: This type of series comprises english alphabets. These alphabets follow a certain pattern with regard to the position of the letters in english alphabets in forward or backward direction.

Example: Find the next term in the following series.
A, D, G, J, ...

Solution: Here, the given series …

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