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# Coding Decoding

A CODE is a ‘system of signals‘. Therefore, coding is a method of transmitting a message between the sender and the receiver without a third person knowing it.
The coding and Decoding Test is set up to judge the candidate’s ability to decipher the rule that codes a particular word/message and break the code to decipher the message.

## Coding Decoding questions

Type of Coding and Decoding questions
There are various type of coding and decoding problem.
Type 1: Letter Codding

In this question. the letters in a word are replaced by certain other letter according to a specific rule to form its code. The candidates is required to detect the coding pattern/rule and answer the questions accordingly.
Example: In a certain code, TEACHER is written as VGCEJGT. How is CHILDREN written in that code?
Solution: If you want to solve this problem in easy way then follow the few step and used this step in all question. By this method you can get correct answer.
Step 1: In this type of problem, first write A to Z letters.
Step 2: After write A to Z letters, identify the letter which is given in problem like (TEACHER is written as VGCEJGT). Here V letter comes after two letter of T, G letter comes after two letters of E, C letter comes after two letters of A ans so on.
Step 3: Now compare CHILDREN, that means After two letter of C , E comes ……And so on..
Further More Details Please watch this video ….

Type 2: Direct Letter Coding

In direct-coding, the code letters occur in the same sequence as the corresponding letters occur in the words.

In questions on direct-coding,either the particular codes of letters are given or the codes of two or more words are given and one is asked to find the codes of given words involving only those letters for which the codes have already been mentioned.

for example, let us consider a language in which A is codes as W, C as P, E as T, L as Z, S as B and T as K. Then the code for CASTLE is that language is PWBKZT.

Such type of coding is called Direct-letter coding.

Type 3: Number/Symbol Coding

In these questions, either numerical code values are assigned to a word or alphabetical code letters are assigned to the numbers. The candidates is required to analyse the code as per the questions.
Clearly, letters and numbers are correlated to each other in no other way except in relation to the position of the letters in the English alphabet. So, either this relation holds or the coding has to be done as per as a set of given rules. In all other cases, the questions is one of direct-coding has to be done as per a set of given rules.

Example: If E = 5, PEN = 35, Then PAGE =?

Solution: Clearly, putting A=1, B=2, C=3, D=4,…..M=13, ……X=24,……..Z=26.

We have

PEN = P + E + N = 16 + 5 + 14 = 35

So PAGE = P + A + G + E = 16 + 1 + 7 + 5 = 29

Ans is 29.

Type 4: Matrix Coding

In this type of Problem you have given two matrix and by compression of two matrix you have to find correct answer.

For Matrix Coding please watch this video.

Type 5: Substitution

In this type of questions, some particular words are assigned certain substituted names. Then a question is asked that is to be answered in the substituted code language.
Example: If ‘cook’ is called ‘butler’, ‘butler’ is called ‘manager’, ‘manager’ is called ‘teacher’, ‘teacher” is called ‘clerk’, and ‘clerk’ is called ‘principle’, who will teach in a class?
Solution: Clearly, a ‘teacher’ teaches in a class and as given, ‘teacher’ is called ‘clerk’. so a ‘clerk’ will teach in the class. Hence the answer is ‘Clerk’.

Type 6: Deciphering message word codes

In this type of questions, some messages are given in the coded language and the code for a particular word of message is asked. To analyse such codes , any two messages bearing a common word are picked up. The common code-word will thus represent that word. Proceeding similarly by picking up all possible combinations of two, the entire message can be decoded and the codes for individual words found.
Example: In a certain language, ‘sun shines brightly’ is written as ‘ba lo sul’, ‘houses are brightly lit’, as ‘kado ula ari ba’ and ‘light comes from sun’ as ‘dopi kup lo nro,. what code-words are written for ‘sun’ and brightly’?
Solution: In the first and third statements, the common word is ‘sun’ and the common code-word is ‘lo’. so, ‘lo’ is the code for ‘sun’.
In the first and second statements, the common word is ‘brightly’ and the common code-word is ‘ba’. so, ‘ba’ is the code for ‘brightly’.