Coding Decoding Reasoning - Questions, Problems, Types and Examples

Coding and Decoding may be classified into five types:

3. Substitution Coding:

In such question, we are going to deal with the pattern of coding in which codes are assigned by the substitution method where in an artificial alternative is assigned to a given word and candidates are required to decipher the coding pattern to substance the other given word.

Example.1. If yellow is called blue, blue is called red, red is called pink, pink is called black and black is called orange, then what is the colour of blood?

(A) Yellow

(B) Pink

(C) Blue

(D) Orange

Ans. B

Solution 

We know, colour of blood = red

But according to question,

red = pink

Therefor, the colour of blood = pink

Important Note: 

For such type of questions, two types of methods are there,

→ called → ‘white’ is called ‘grey’.

Here, ‘grey’ is the code of ‘white’.

→ means → ‘white’ means ‘grey’.

Here, ‘white’ is the code of ‘grey’.

4. Deciphering Coding: 

In these types of question, we are going to deal with a message bearing a common code for given word/numeral. Candidates are required to identify the code from the common property of word/numeral and decipher the given codes with best alternatives.

Example.1. In a certain code language, 

‘more money in market’ is written as ‘zo li aa to’,

‘share in market profit’ is written as ‘vo to je li’,

‘making more profit now’ is written as ‘su je zo ka.’ And

‘now the market gains’ is written as’ do li yo su.’

Which of the following does ‘vo’ stand for?

(A) profit

(B) in

(C) market

(D) share

Ans. B

Important Notes:

* While dealing such questions, choose the common term from the given statement.

* More than one statement is to be used for selecting the common term.

5. Symbol Coding: 

In this, we are going to deal with the questions, in which a set of symbol is assigned to a group of letter. Candidates are required to identify the relation between the letter and symbol and decipher the pattern of coding and choose the best alternative as well.

Ex.1. In a certain code ‘TRAIN’ is written as ‘39*7%’ and ‘MEAL’ is written as ‘4$*@’. How is ‘ITEM’ written in that code?

(A) 7$34

(B) 73$4

(C) 79$4

(D) 73*4

Solution 

Ans. B.

Important note: 

* Identify the letter and its code very carefully.