Access free live classes and tests on the app
Download
+
Unacademy
  • Goals
    • AFCAT
    • AP EAMCET
    • Bank Exam
    • BPSC
    • CA Foundation
    • CAPF
    • CAT
    • CBSE Class 11
    • CBSE Class 12
    • CDS
    • CLAT
    • CSIR UGC
    • GATE
    • IIT JAM
    • JEE
    • Karnataka CET
    • Karnataka PSC
    • Kerala PSC
    • MHT CET
    • MPPSC
    • NDA
    • NEET PG
    • NEET UG
    • NTA UGC
    • Railway Exam
    • SSC
    • TS EAMCET
    • UPSC
    • WBPSC
    • CFA
Login Join for Free
avtar
  • ProfileProfile
  • Settings Settings
  • Refer your friendsRefer your friends
  • Sign outSign out
  • Terms & conditions
  • •
  • Privacy policy
  • About
  • •
  • Careers
  • •
  • Blog

© 2023 Sorting Hat Technologies Pvt Ltd

  • CAT 2023
  • Study Materials
  • Notifications
  • CAT Syllabus
  • CAT Mock Test
  • CAT Exam Pattern
  • CAT Question Paper
  • CAT Preparation Books
  • Downloads
  • Important Formulas
  • Eligibility Criteria
CAT 2025 » CAT Study Material » Data Interpretation and Logical Reasoning » Coding and Decoding
scholarship_cat

Coding and Decoding

Coding is a method that enables a sender and a receiver to communicate with one another while preventing a third party from understanding what is being said. The data is encoded before it is transmitted, and then it must be decoded at the receiving end in order to recover the original data. This is accomplished by locating common keys within the encoded data.

Table of Content
  •  

To start off your preparations for the competitive examinations, coding and decoding is a fascinating topic to study. It is possible to understand it as a group of questions that are based on specific concealed rules, discovering which pupils have to decode the message and provide the correct answer. This may be comprehended in a simple way. Questions involving coding and decoding are typically found in the logical reasoning part of tests.

What exactly are Coding and Decoding?

In its most basic form, coding can be described as the process of encrypting a word or a string of numbers using a certain code or pattern that is based on a predetermined set of guidelines. On the other hand, decoding is the opposite of encoding in that it seeks to decrypt a specific code by locating a common pattern or structure.

Different Methods of Coding and Decoding

You should be prepared to answer questions requiring both coding and decoding in the numerous competitive examinations that you take. The following are examples of some of the most common types:

Letter to Letter Coding

In this method of coding and decoding, the alphabetic components of a word are encoded by employing a variety of mathematical operations such as addition, subtraction, interchanging, and so on. Candidates need to apply the same approaches in order to decode the code for another word.

Coding based on letters and numbers

In this manner of coding and decoding, numerical code values are assigned to words, and alphabetical code letters are assigned to numbers.

Coding Through Substitution

In this method of coding and decoding, words are first encrypted, and then coded, using the relevant keyword.

The Chinese Coding System

Using this method of encoding and decoding, a few assertions that include the same words but are arranged in a different order will be coded as various words, symbols, or characters. Candidates are required to locate the codes of words by searching for keywords that are shared throughout several sentences. This is because the code of a word will remain consistent no matter where it appears.

LSN Coding

In this method of coding and decoding, words from a variety of statements are encoded with letters, symbols, and numbers using a variety of different processes. The words are then decoded. Candidates are expected to make inferences about the meanings of the numbers, letters, and symbols they are given.

Coding based on conditions

In this kind of coding and decoding, a few methods will be taught, and applicants will be expected to apply all of the requirements that have been provided in order to obtain the code for a specific word.

Coding of the Clock

In this kind of coding and decoding, the numbers from 1 to 12 are encoded, and the answers to the questions are based on the clock time.

Binary Coding

In this form of coding-decoding, decimal numbers are encoded using binary values such as 0 and 1, among other possible combinations.

Conclusion

During the time that you spend preparing for the subject of coding and decoding, it is essential to become familiar with specific guidelines that will assist you in salting questions in a timely manner. For further information on this topic, see the strategies listed below:

To get started, give the question a thorough reading and make a note of all the key terms, along with the corresponding codes for each one.

Make an effort to decipher the pattern of the code that has been provided to you. You may use the hit and trial strategy to investigate a number of different rules.

It is also possible to utilise the elimination approach in order to simplify the quote and delete any values that are not necessary.

It is essential to keep in mind that the coding and decoding problems can be answered using a variety of different strategies.

Getting through a large number of questions will be beneficial for you as you prepare for the exam.

faq

Frequently asked questions

Get answers to the most common queries related to the CAT Examination Preparation.

Let's say that one particular TIGER has the letters QDFHS inscribed instead of it. Determine how the letter 'FISH' will be written using the same code.

GERH  GRHE...Read full

By applying a certain algorithm, the word "HILTON" can be deciphered as "IHTLNO." Which of these is the best choice for the word "BILLION" encoded in the same form?

IBLLION IBOIL...Read full

If the word "FROZEN" is decoded as the letters "OFAPSG." Mark the appropriate choice that shows the word "MOLTEN" written in this fashion.

OFPOMN  OFSM...Read full

Which of the following months will have exactly 30 days if January is renamed "March," March is renamed "April," and April is renamed "May"?

January  Mar...Read full

If cake is referred to as "egg," if egg is referred to as "coffee," and if coffee is referred to as "tea," then which beverage is white?

Answer: Egg has a white colour.  But since coffee is a nickname for eg...Read full

  • GERH 
  • GRHE
  • GREH 
  • GHRE 
  • GEHR

Explanation: You will need to invert the word and shift each letter by one position in order to solve this coding-decoding puzzle. The order of the letters in FISH when read backwards is HSIF. Now take one away from each alphabet in HSIF. GRHE is the secret code for FISH.

  • IBLLION
  • IBOILLN 
  • IBLLOIN 
  • IBLOILN 
  • IBOLLIN

Explanation: To begin, pairs of letters are grouped together, such as BI, LL, IO, and N. This is the first step in the process. In each of the four pairs, the relevant letters are moved to different positions, which results in the letters IB, LL, OI, and N. As a result, the code for billion is written as Ibllion.

  • OFPOMN 
  • OFSMPN
  • OFUMPN 
  • OFUNPN 
  • OFUMON

Explanation: The answer to this question can be found by simply inverting the word and adding one point to each letter. NETLOM is the letter sequence that comes before MOLTEN in the alphabet. Now, if we take each letter in MOLTEN and add 1 to it, the resulting code is OFUMPN.

  • January 
  • March 
  • April 
  • May

Answer:

The months of January, March, and May each have 31 days, whereas April only has 30 days.

However, April is now considered to be May, thus the correct answer is May.

Answer: Egg has a white colour. 

But since coffee is a nickname for egg, coffee is the correct response.

 

Crack CAT with Unacademy

Get subscription and access unlimited live and recorded courses from India’s best educators

  • Structured syllabus
  • Daily live classes
  • Ask doubts
  • Tests & practice
Learn more

Notifications

Get all the important information related to the CAT Exam including the process of application, important calendar dates, eligibility criteria, exam centers etc.

CAT Eligibility Criteria 2023
CAT Exam Pattern 2023
CAT Result 2022
CAT Syllabus 2023 – CAT Exam Syllabus – Download Latest PDF
IBSAT 2022 Notification
IIFT Notification
MAH CET Notification
MICAT Notification
NMAT Notification
SNAP Notification
TISSNET Notification
Top Colleges in India That Accept CAT Score
XAT Notification
See all

Related articles

Learn more topics related to Data Interpretation and Logical Reasoning
Wilson Remainder Theorem

To reduce huge numbers with regard to a certain modulus and to solve congruences, Wilson's theorem and Fermat's theorem can be employed.

Why Use the Critical Path Method

A brief note on Why use the critical path method, Improves future planning, Facilitates more effective resource management, Helps avoid bottlenecks and many things.

What is Types of Analogy Reasoning

In this lecture we’re going to learn about types of analogy reasoning, the number based/numerical analogy, letter and number based analogy and general knowledge-based analogy, questions based on analogy and many more things.

What is Posterior Probability

A posterior probability, in Bayesian records, is the revised or updated probability of an event happening after taking into account new records. The posterior probability is calculated by updating the prior probability by using Bayes’ theorem. In statistical phrases, the posterior probability is the probability of event A taking place given that event B has taken place.

See all
Access more than

469+ courses for CAT – Optional

Get subscription

Trending Topics

  • CAT Mock Test
  • CAT Question Papers
  • CAT 2021 Question Paper
  • CAT 2020 Question Paper
  • CAT Question Paper 2019 PDF
  • Best Books for CAT Preparation
  • CAT Eligibility Criteria
  • CAT Syllabus
  • CAT Exam Pattern
  • CAT Result
combat_cat

Related links

  • Co-ordinate Geometry applications
  • What Is A Polygon?
  • Uses of a Quadrilateral
  • Algebraic Identities
  • SPSS Full Form
  • Geometric Progression’s Uses
  • Blood Relation Questions
freeliveclasses_cat
CAT 2024 Question Paper
.
Company Logo

Unacademy is India’s largest online learning platform. Download our apps to start learning


Starting your preparation?

Call us and we will answer all your questions about learning on Unacademy

Call +91 8585858585

Company
About usShikshodayaCareers
we're hiring
BlogsPrivacy PolicyTerms and Conditions
Help & support
User GuidelinesSite MapRefund PolicyTakedown PolicyGrievance Redressal
Products
Learner appLearner appEducator appEducator appParent appParent app
Popular goals
IIT JEEUPSCSSCCSIR UGC NETNEET UG
Trending exams
GATECATCANTA UGC NETBank Exams
Study material
UPSC Study MaterialNEET UG Study MaterialCA Foundation Study MaterialJEE Study MaterialSSC Study Material

© 2025 Sorting Hat Technologies Pvt Ltd

Unacademy
  • Goals
    • AFCAT
    • AP EAMCET
    • Bank Exam
    • BPSC
    • CA Foundation
    • CAPF
    • CAT
    • CBSE Class 11
    • CBSE Class 12
    • CDS
    • CLAT
    • CSIR UGC
    • GATE
    • IIT JAM
    • JEE
    • Karnataka CET
    • Karnataka PSC
    • Kerala PSC
    • MHT CET
    • MPPSC
    • NDA
    • NEET PG
    • NEET UG
    • NTA UGC
    • Railway Exam
    • SSC
    • TS EAMCET
    • UPSC
    • WBPSC
    • CFA

Share via

COPY