Coding Decoding Tricks, Approach, and Questions

 CODING DECODING CONCEPT & TRICKS

It is one of the popular topics from the examiner's point of view. They used to frame questions based on this topic. 

Do you know why this topic has been asked in almost all competitive exams like- 

CSAT, BANKING, SSC, CLAT, CAT, STATE PCS, many more/. 

Ans- Because it is based on intelligence.

MEANING OF CODING-DECODING

In this current   time  each and every  person  talks  with some unique code word so that no one can’t know what is going on, usually, we do in the classroom to keep hide our secrets from teachers.  In the whole system, there is one, who wants to send  Information called sender and other who gonna receive it called receiver. when sender encodes their information with some special words /alphabets /digits etc  is called coding and the same information is completely understood by another side i.e., The receiver side is called decoding. in this whole process we can easily understand that whatever sender used logic to encode information, the same logic is used by the receiver in another end to decode it.

In real life application this chapter is vitally used by the intelligence department (RAW/IB)  of various countries entire the world.

In questions of coding-decoding a word will be coded on some fixed pattern so, before to proceed further we have to study all alphabets once again to better understand.

Forward place value- When we count alphabet position from our left hand, It is called their forward place value position.

Ex- Place value of A = 1 = Because it is at the oneth place from the left end.

      Place value of Z = 26: Place value of E = 5 , Place value of J= 10.

Reversed Place Value- When we count alphabet position from our right hand, it is called reversed place value of alphabet/ Backward position of the alphabet.

Ex- Rev. place value of A = 26

      Rev. place value of Z=1 

How we recognize the position of each alphabet 

It is the most challenging to remember the position of each alphabet in this present time, where you study many subjects to crack competitive exams.
But here there is a way to remember the position of each alphabet through the relative position of the following word- "E   J   O   T   Y".

 Where Place value of E = 5 , J= 10  ,  O=15  , T = 20 , Y = 25.

Suppose we have to find the place value of H = H  is just three places more than/Away E place so, 

H = 5 + 3  :    similarly , U = T +1 = 20 +1 = 21     ,    W = (T=20) + 3 = 23 

N= M+1 = 13 +1 = 14 

SOME OBSERVATIONS-

Ø       1.The Sum of forward place value and Backward /Reverse place of each alphabet is always 27. you can check above in which 13 alphabets have been written in one row and another in the second row, written in a such way  that is making opposite pair letter.

Ex-  Forward place value of A (1) + Backward place value of A(26) = 27

        Forward place value of B(2) + Backward place value of B(25) =27 

   

HOW TO REMEMBER THE OPPOSITE ALPHABET  PAIR  OF EACH ALPHABET –

TRICK-     

Opposite pair letters trick for recognize -

opposite of E/V= V/E       remember through the word    EVM Machine.

opposite of F/U= U/F       remember through the word     FUN/FUNNY.

opposite of G/T= T/G       remember through the word    GT ROAD

opposite of H/S =S/H       remember through the word   HIGH SCHOOL

opposit   of I/R  = R/I      remember through the word INDIANRAILWAY 

opposite  of J/Q  = Q/J     remember through the word  Jaqceline actress

opposite of K/P   = P/K     remember through  the word  PK MOVIE

opposite of L/O   = O/L     remember through the word     OLX.  

How we will use opposite pair letter concept in questions –

 Take a question -if in a code  language word “EXAM “ is coded as  “ VCZN” then find the code of following word –

1.     1.  DELHI                2.        MUMBAI                    3.   POLITICIAN                              4.  HANG OVER

 

Solution – At  First  Think about how the examiner wrote the word “EXAM “ into “ VCZN”.  Whenever you are dealing with the coding-decoding chapters please keep in your mind alphabet positions  & opposite alphabet pairs.

Here,   E  became v means = opposite pair latter ( EVM) , similarly- X became C = Opposite pair

 So logic is simply writing opposite letter.

DELHI =  WVOSR

MUMBAI= NFNYZR

POLITICIAN=KLORGRXRZM

HANG OVER = SZMT  LEVI

SOME IMPORTANT OBSERVATIONS –

·         POSITION OF ANY ALPHABET FROM LEFT END + POSITION OF SAME ALPHABET FROM RIGHT END =  27

EX-   POSTION OF B FROM LEFT = 2

         POSITION OF B FROM RIGHT = 25

          B FROM LEFT + B FROM RIGHT = 2 + 25 = 27

·         Whenever one position from either end is known of any alphabet then you can find the position of same  alphabet from another end by subtracting from 27

Ex-   position of X from the left end we know = 24  

       Position of x from right end = 27- 24 = 3   ie,  C having place value = 3

So, opposite pair of x is c or vice –versa  .

Now we will see some important  types of questions based on you will be able to solve questions 

TYPES OF QUESTIONS-

TYPE 1- Letter coding - 

Logic – in this letter coding letters of a word are replaced by certain other letters  according to some fixed pattern/rule to encode a word . you are required to find that same logic/pattern which was used to encode that word . it  is very easy only you have to do some questions.

Ex-  In a certain code language ‘ DELHI ‘is written /encode as ‘ FGNJK’, How would  ‘ MUMBAI’be written in that same code language?

Sol-   we can see  that, D became F  . How it can possible to just adding 2 in place value of D.

         Similarly ,  E became  G = By adding 2 in place value of E

  So logic is clear just moving two alphabets from given alphabet

So,     MUMBAI -  O W O D C K  

TYPE2-SUBSTITUTION CODING – "IS CALLED  PATTERN”

Logic – in this type of coding  some particular words are assigned  with certain substituted names  then questions are framed based on that logic .we can best understand with some examples.

Ex1 -  if ‘white’ is called ‘blue ‘,  ‘blue’ is called ‘red’, ‘red’ is called ‘violet’ , ‘violet ‘is called ‘green’ then what would be the color of ‘BLOOD’  ?

Sol-   when you get these types of questions don’t go for reading all lines. just go for the last line . in the last line asking the color of blood, we know in real life the color of blood is red just stop here. now, check ‘Red ‘ is called?  , after reading we can get it is given ‘Red’ is called  ‘Violet’.    Hope you will understand.

Ex2- -  If ‘white’ is called ‘blue ‘,  ‘blue’ is called ‘red’,  ‘red’ is called ‘violet’, ‘violet ‘is called ‘green’ then what would be the color of ‘sky’  ?

 Sol- As I said don’t go to read each line, it will kill your time just go directly to the last line. color of the sky – we know in real life the color of the sky is blue . after getting answers to the asked questions. next go for BLUE is called?  , you will get your answer from second-line = blue is called red = RED will be the answer. 

 

TYPE3 – SUBSTITUTION CODING – “ MEANS" PATTERN”

Logic – it is just another type of pattern known as means the pattern of substitution coding. we can better understand through some examples –

Ex- 1 .   If ‘white’ means  ‘blue ‘,  ‘blue’ means ‘red’,  ‘red’ means ‘violet’, ‘violet ‘ means  ‘green’ then what would be the color of ‘sky’? 

Sol-   as usual like the last pattern don’t read all lines just go to the last line which is the color of the sky, ask yourself what is the color of the sky in real life = Blue. now  check    ?  means  blue ie, what thing means blue the same thing will be answered = i.e., white. in the first line white means blue.

Note – I am putting from one single example and applying for different patterns of questions so that you will be master of this topic, our intention is clear to be each and every student should understand this. 

TYPE4- 

DECIPHERING  MESSAGE WORD CODING  -

Logic – in this type of questions,  there have been two or more than two sentences are coded as some alphabets /group of alphabets  based on that you will have to find code of corresponding word. Each word will be coded as some meaningless word . we can best understand with best examples-

Ex-1  In a certain code language: ‘student Home Money ‘ is written as ‘nt oh en ‘, ‘Money Income hike ‘ is written as ‘en mo ie’, ‘Home school student ‘ is written as ‘nt oh cl ‘, ‘Repeat Income Money’ is written as ‘mo en et’.

a.       What may be code for  ‘ Money’  ?

b.      What may be code for ‘Income ‘?

c.       What may be code for   'Hike’?

d.      What may code for ‘ Repeat’?

 

Sol-   Here there are four questions that have been asked. don’t worry. we will solve it easily .  in the first question  Monkey code, we have to find it. just do it stepwise

  Step 1 - Search where the word ‘money ‘ has been present in the given four sentences.  at first look, we see the word ‘monkey' first sentence, second  & fourth sentence. keep numbering in your mind as it is given to you ie, if it appears first then it will be the first sentence and so on 1,2,3 &4.

Step 2 – check which word is common in the coded section in 1,2 and 4th sentences . one coded word “ en” is present. so, the code of the word  “ MONEY” WILL BE = En

TRICK – JUST TRY TO FIND COMMON WORDS IN ALL THE SENTENCES, IF YOU FOUND THEN JUST GO FOR FINDING COMMON WORDS IN CODED PART. 

b.in the similar way code of ‘income ‘ can be found using second and fourth sentences =  Mo

c. we have to find the code of ‘Hike ‘, we are seeing that Hike is only present in the second sentence so the coded word should be not present anywhere except for the second sentence itself so, only ‘’Ie “ is a word that is not present anywhere so, our answer will be ‘’ Ie”.

d.” Repeat” – in a similar way we can find for repeat = ‘’Et” 

        

TYPE -5 – NUMERAL CODING –

Logic - When each word is coded as a number. 

We can best understand with an example –

Ex- In a certain code language ‘786’ mean ‘’study very well “, ‘958’ mean “ Well work pays” and ‘645’ mean  “ study and work “.  Which could be following the code for  ‘’ study”?

a.    a.   6

b.    b.  6/8

c.      c. 7

d.    d.  None

Sol-   Always only focus on common words in all sentences. Here there are three sentences. ‘STUDY’ is common in only first and third sentences now, your work is over just check the corresponding code which one is common in the first and third sentences the, we find only ‘6’ is present in sentences 1 and 3. So, code of ‘study ‘ = 6 – answer a.