Reasoning: Concepts and Sample Questions: Coding and Decoding

The experts of Jagranjosh.com have come forward to help the aspirants in attempting all the questions speedily with basic preparatory strategy. By providing basic concepts, we are trying to make the calculation faster than doing from long and traditional ones.

In this topic, Coding is a method of transmitting a message between the sender and the receiver which third person cannot understand or comprehend. The coded message can be deciphered or decoded by the receiver as he/she knows the rule/method which was receiver as he/she knows rule/method which was employed in encoding the message. Thus, CODING and DECODING test is given to judge the candidate’s ability to decipher the rule which is applied for coding a particular message and break the code to reveal the message.

Type 1

In order to solve questions pertaining to code based on English alphabet you must know the position of each letter from either end so that you can recognize the coding pattern quickly.

1. Position of alphabets from left to right:

2. Position of alphabets from right to left

3. Series of Opposite Alphabet

On the basis of these matrices you can recognize the coding pattern of letter quickly.

For instance, suppose the code for L is Q. it is clear that Q is to the right of L and position of L is 12^th from left and that of Q is 17^th from left.

Now, state what will be the code of E?

The code for E would be J.

E₅ → J₁₀

A. Code consisting of jumbled letters of given word

In this type of coding pattern the letters of the given word are jumbled to generate the code.

B. Code Consisting of the preceding or following letter

In this type of questions, either preceding or following letters stands as code letter for each of the letter of the given word.

Example1. In a certain code language INACTIVE is written as VITCANIE. How will COMPUTER be written in that code language?

(A) UTEMPOCR

(B) MOCPETUR

(C) ETUPMOCR

(D) PMOCRETU

(E) None of these

Sol. (C):

(i) There are 8 letters in the word.

(ii) In the given code the fourth and eighth letters from left have been left intact.

(iii) The first letter exchanges positions with the seventh letter, the second letter with the sixth letter and the third letter with the fifth letter.

Similarly,

Example2. In a certain code DOCUMENTS is written as VDPENRSMD. How is ADVERTISE written in that code?

(A) FWEBSDRHS

(B) FWENSSHRD

(C) BEDFSDRHS

(D) FWEBSFMLD

(E) None of these

Sol: (A):

Similarly,