Coding and Decoding

Coding and Decoding

The Coding and Decoding Test is designed to test the candidate's ability to find the rule under which a message has been coded and decipher the message in the original form. In these questions, the code values are assigned to a word or a set of words and the candidate is required to set the word in the original form.

Based on various type of questions asked in different examinations,it is divided into 4 types of categories.
1)Letter Coding
2)Number Coding
3)Substitution Coding
4)Mixed Coding and Mixed Number Coding.

In this type, Letters of a word are reshuffeled to make it a coded word.On the same pattern you have to find code word of a given word.
(or)
The words are coded in such a way that certain letters stand for certain other letters in a set pattern.On the same pattern you have to find code word of a
given word.

To solve the question of this section, the candidate has an idea about the Alphabet Letter series.In the below has been given a forward letter series Reverse letter series and opposite letter series.

1. Forward order of letters and corresponding numbers:

1  2  3  4  5  6  7  8  9  10  11 12  13   14 15
A B  C D E  F  G H  I    J    K   L    M     N  O

16  17  18  19  20  21  22  23   24  25  26 
P    Q    R   S   T    U     V    W    X   Y     Z  

2.Reverse order of letters and corresponding numbers:

1   2   3    4    5   6   7   8   9   10   11   12   13   14   15
Z   Y   X   W   V   U  T   S  R   Q    P     O     N     M    L

16  17  18  19   20   21   22   23   24   25   26
K    J     I      H    G     F     E    D    C     B     A

3. Second half of the alphabet in reverse order:

A B C D E F G H I J K L M

Z Y X W V U T S R Q P O N

Example:
In a certain code IMTITJU is Written as TMIIUJT.How is TEMREMP written in that code?
1.METERPM    2.METRPME  3.ETRMMEP   4.MTERPME  5.None of these
Solution:(2)
Explanation:In the given code, the letters of even numbered position have been left as they are while the first and the third letters have been interchanged.
Similarly, the fifth and the seventh and the seventh letters have been interchanged.

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