SSC Combined Higher Secondary Exam: General Intelligence: Coding Decoding - Study Material

Staff Selection Commission is all set to conduct the written examination for SSC Combined Higher Secondary Level Examination 2013 to recruit candidates for various posts of Data Entry Operator and Lower Division Clerk.

Created On: Sep 23, 2013 12:57 IST
Modified On: Oct 23, 2013 16:31 IST
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Staff Selection Commission is all set to conduct the written examination for SSC Combined Higher Secondary Level Examination 2013 to recruit candidates for various posts of Data Entry Operator and Lower Division Clerk. SSC – CHSL Exam 2013 is scheduled to be conducted on 20 October 2013, 27 October 2013, and 10 November 2013. The written examination comprises 200 questions divided in 4 different sections -- General Intelligence, General Awareness, Quantitative Aptitude, and English Language.

The General Intelligence Section of SSC - Combined Higher Secondary Level Examination that contains 50 questions from topics like Classifications, Analogy, Coding-decoding, Directions, Blood relation etc., is quite a challenging but highly scoring according to the paper.

Here, the SSC experts of have provided with the description of Coding-decoding chapter to let you understand the basic concept of the subject.

Coding Decoding

Coding Decoding test is to judge a candidate’s ability to decipher the code language. Coding is the process of converting a word into another language by using letters and numbers while decoding is to convert the coded value back into the normal language. In each question of this topic a word and coded form of the word will be given to the student. A student will required to decode the logic behind this coding and then apply the logic to another given word to find the answer in form of a code.


English alphabets and their corresponding number values help the candidate to increase the performance in this area. The position of the letter in the English Alphabet is considered to be the value of the alphabet in questions on letter series. Also, when we are counting from A to Z, we again start with A, i.e. we treat the letters as being cyclic in nature. While attempting the letter series one should know the value of each of the alphabet as

Alphabets in natural series are:

The Word EJOTY is very helpful in finding the position of the alphabet as

For example, if we want to find the position of the alphabet ‘S’, then as we know that ‘T’ is 20, so ‘S’ is 20 - 1 = 19. Also, we can find the position of an alphabet from the end by subtracting its value from 27. For example, the position of D from the end is 27 – 4 = 23.

The pattern below is very useful to find many types of question in Alphabet Series when we write the last 13 alphabets in front of the first 13 alphabets of the English:

The questions on coding and decoding are basically of three types as given below.


1. In a certain code ‘SHIMLA’ is written as ‘RGHLKZ, how will PATNA be coded then?

a) OZTMZ                 b) OZSMZ                    c) QBUMB                   d) OZTZM

Sol: Each letter is coded as the letter previous to it, i.e. S = R, H = G, I = H, M = L, L = K, A = Z. PATNA will become OZSMZ. Hence the answer is (b).


2. If LODES is coded as 46321, how will you code the word DOES?

a) 1234                        b) 4321                        c) 3621                        d) 3261

Sol:      Here, you will observe that all the letters of DOES are included in the letters of LODES, for which you have the code D = 3, O = 6, E = 2, S = 1. Therefore DOES = 3621. So, the answer is (d).


3. In a certain code ‘415’ means ‘milk is hot’; ‘18’ means ‘hot soup’; and ‘895’ means ‘soup is tasty’. What number will indicate the word ‘tasty’?

a) 9                              b) 8                              c) 5                              d) 4

Sol:      The code for ‘hot’ is 1. So, the code of ‘soup’ is 8. Now the code of ‘is’ is 5. Hence we can say that the code of ‘tasty’ is 9. So, the answer is (a)                            

Questions From Previous Year Papers

1. If 'POST' is coded as 'KLHG', how is 'NURS' coded as? (From SSC Higher Secondary Level Exam 2012)

(1) MFJH

(2) MGJH

(3) MFIH

(4) MFIG

Solution 1. (3)

Pairs of Opposite Letters,


2. If GARMENT is written as 202691422137, how is INDULGE written in that code? (From SSC Higher Secondary Level Exam 2012)

(1) 9144211275

(2) 914211275

(3) 1813326152022

(4) 1813236152022

Solution 2. (4) Number corresponding to letter is subtracted from 27 to give the following pattern.

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