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Coding Decoding Questions – Reasoning and Examples

Coding Decoding Questions

Coding decoding questions are frequently asked in competitive exams such as SSC, Railways, UPSC, Defence, Banking, Teaching, and other State Govt Exams. In coding-decoding questions, the actual letter in the word must be replaced with another letter according to a specific rule specified in the code. The student is required to identify and respond to the specific rule.

Coding Decoding Reasoning

Many competitive exams include a Coding Decoding Reasoning section as an important and scoring part of the paper. A set of letters and numbers are coded in a specific way in this type of Coding Decoding reasoning question, and candidates are asked to decipher the pattern and code other words or numbers in the same way. The codes are based on various patterns and principles so that the message at the other end can be easily deciphered or decoded. It essentially assesses the candidate’s ability to decipher code language.

Reasoning Coding Decoding

Reasoning coding-decoding is intended to assess a person’s logical aptitude or ability. This is one of the most common sections found in all major competitive government exams. Many candidates find reasoning coding-decoding questions difficult to solve, so they avoid these questions and lose some easy marks. In each question on this topic, a word and its coded form will be provided. Students must decode the logic behind this coding and then apply the same logic to another given word in order to find the answer in the form of a code.

Coding Decoding Meaning in Hindi

The candidates appearing for various exams via the Hindi medium also need to go through the concepts mentioned in this article. So we have also taken care of the needs of the Hindi Medium students regarding this topic. Check the link given below for coding decoding meaning in Hindi.

Coding Decoding

Coding is the process of encrypting a word or a number using a specific code or pattern based on a set of rules. Decoding is the process of converting a pattern into its original form from given codes. Coding is thus a method of transmitting a message between sender and receiver that a third person cannot understand or comprehend. The Coding Decoding test is designed to assess a test-ability taker’s to decipher a specific word or message by breaking or decoding the code. Types of coding-decoding:

  • Letter coding: It is a type of decoding in which the letters of words are replaced by other letters based on specific patterns/rules to form a code.

Coding and Decoding

  • Number/ Symbol coding decoding: It is a method of assigning numerical code values to words or alphabetical code letters to numbers.


  • Substitution coding: It is a type of decoding in which specific words are given substituted names. Example- If the desk is called “chair”, the chair is called “blackboard”, the blackboard is called “duster”, the duster is called “chalk”, and then where do you sit in the classroom?
    1. Blackboard
    2. Chair
    3. Desk
    4. Duster

Ans. According to this problem, you sit on a blackboard – (1)

Coding Decoding Questions – Examples

Candidates can practice sectional tests, full-length tests and previous year questions to get a better idea regarding the level and trend of questions asked under this topic in the Reasoning Section. For the reference of the candidates, we are providing some solved examples of the coding-decoding topic. Going through these will give the candidates a better understanding of the concepts.

Q1. If ROSE is coded as 6821, CHAIR is coded as 73456, and PREACH is coded as 961473, what will be the code for SEARCH?

Ans. The code for SEARCH is 214673

Q2. If FRIEND is coded as HUMJTK, how is CANDLE written in that code?


Q3. If MONKEY is written as XDJMNL, how is TIGER written in that code?


Q4. If ENTRY is coded as 12345 and STEADY is coded as 931785, then what is the correct code for NEATNESS?

Ans. 21732199

Q5. If NOTEBOOK is coded as REGOLEEN, and SHIRT as XYZBG, then TORN is coded as


Q6. In a certain code, ‘247’ means ‘spread red carpet’; ‘256’ means ‘dust one carpet’ and ‘234’ means ‘one red carpet’. Which digit in this code means ‘dust’?

Ans.  5

Q7. If “A” means “subtraction”, “B” means “division”, “C” means “addition” and “D” means “multiplication”, then 330 B 6 A 32 C 45 D 12 = ?

Ans. 563

Q8. If MILITARY can be written as 1, 2, 3, 2, 4, 5, 6, 7 then how can TIMLI be written in that code?

Ans. 4, 2, 1, 3, 2

Q9. If HAT is coded as ‘jcv’ then what will GUN be coded as?

Ans. iwp

Q10. In a certain coding language, if GO = 32 & SHE = 49 then SOME will be equal to?

Ans. Here the values of the alphabets are taken in reverse order, i.e, A=26, B=25…, Z=1
[G = 20 ]+ [O = 12 ]= 32
[S = 8]+ [H = 19]+ [E = 22] = 49
SOME = 8 + 12 + 14 + 22 = 56.

Coding Decoding Questions – FAQs

Q1. What do you mean by coding?

Ans. Coding is the process of encrypting a word or a number using a specific code or pattern based on a set of rules.

Q2. How many types of coding-decoding questions are there?

Ans. Letter coding, Number coding, and Symbol coding decoding are some of the types of coding-decoding questions.

Q3. What is the meaning of decoding?

Ans. Decoding is the process of converting a pattern into its original form from given codes.