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Coding and Decoding:

1.INTRODUCTION : A code is a input signal. Coding and Decoding is reasoning problem .Code has always been  used to  transmit message in  such a way  that they are not ordinary understood unless these are decoded. We can say its method of transmitting a message between receiver and the sender without a third party knowing it. Coding and Decoding is part of verbal reasoning. Coding and Decoding based on alphabets and numerals are also used to code the messages.

Coding and Decoding divided into following type:

1.Alphabet Type:

2.Numerals Type:

3.Symbol and Numerals Type:

4.Group Of Words Type:

5.Reasoning Type:

Type Number 1: Based on Alphabet

1.1 Reversal alphabets:

We can say the last letter is the coded of the first letter. It  is the easy way of the coding and major thing to be looked we looked at a coding.

Ex[1].In code language “BREAKDOWN” is written as “NWODKAERB”. How will “TRIANGLES” be written is that code language.






Explanation: you can say the order of letter has been reversed in code. The coding given above , TRIANGLES will be coded as SELGNAIRT.

Ex[2].In Code Language “INACTIVE” is coded as “VITCANIE”. How will “COMPUTER” be in that Language?




(d).None of these


Explanation: Eight letter there in word. In the given Language fourth and the eighth letters from have been left intact

You can see 1st letter exchange position with the 7th letter and the 2nd letter exchange with the 6th and so on.

1.2 coding and decoding based on opposite letter:

Ex[3]. In certain language COMBINE is written as XLNYRMY in the give option represent FLOWER in that language?




(d) None of these

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Answer (b)

Explanation The word is COMBINE is coded word XLNYRMV.SO logic is X is opposite letter of C , L is opposite of O. N is opposite Of M and so on. So the FLOWER will be coded as UOLDVI.

Ex[4].In certain code language , “SECONDARY” is written  as “QFBPNCBQZ,. Which of the following represent “WONDERFUL” in that Language?




(d)None of these

Answer (b)

Explanation :    S          E       C        O       N        D          A         R        Y

                           -1       +1      -1      +1       +0       -1        +1       -1       +1

                            Q         F        B       P         N        C          B         Q       Z

Similarly Apply this logic in Word “WONDERFUL” You will  get “VPMEEQGTM”

1.3 Coding and decoding based on Jumbling of letter:

EX[5]. In certain code language “TEMPORARY” is coded as ‘YMEROPRAI. How will DESIGNATE be written is that code language?




(d)None of these


Explanation:        T         E         M       P       O         R        A       R          Y

                               1          2        3        4        5         6        7         8         9

                               Y           M      E        R         O        P       R         A          T

                               9             3      2         6        5         4        8       7            1

 You can apply similar logic in word DESIGNATE you will get  word ESENGITAD

1.4 Coding and Decoding additional alphabet:

Ex[4] In Certain language DELHI is written as CEDFKMGIHJ. Which of the following written KOLKATA in that Code?




(d)None of these


Explanation: We can see that there are five letters in the word DELHI and it is written in ten letter. So we can say two letter has been used for every one letter in the word DELHI. So we can easily observed that for the letter D two letter C And E has been used. And Letter for E the two letter used D and F. You can conclude that preceding and succeeding letter have been code each letter.

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