As all are aware that a bank entrance exam tests your aptitude. Quantitative Aptitude, Reasoning Ability, English Language and General Awareness are the key areas tested in a bank entrance exam.
‘Coding-Decoding’ is a part of the Reasoning Ability section. You can either score brilliantly or waste a lot of time with no satisfactory output. The more prepared you are, the better is your score.
This article will take you through ‘Coding-Decoding’ concepts and smart ways to solve questions based on ‘Coding-Decoding’. Let’s first understand what coding and decoding is? What types of questions are asked from this topic?
What is ‘Coding-Decoding’?
- Coding is a way of transmitting data between the sender and the receiver in an encrypted manner i.e. without any other person knowing about it.
- Before transmission, the data is encoded and when it is received, it is decoded in order to obtain the original data.
- This prevents the data from getting corrupt and leaked.
After knowing what coding and decoding are, let us further read about what type of questions are asked in bank & SSC exams.
The relevance of ‘Coding-Decoding’ in Reasoning section?
- ‘Coding and Decoding’ carries significant weightage in various banking & SSC exams, not only this these questions are asked in various other recruitment exams. The concept and approach remain the same, only the level of difficulty varies.
- In SSC exams, the level of difficulty in easy to moderate while in bank exams, the level of difficulty is difficult.
- There are 5-7 questions based on ‘Coding and Decoding’ in bank/SSC exams.
- Classification of ‘Coding and Decoding’ questions is as follows:
- Letter Coding
- Mixed Letter Coding
- Mixed Number Coding
Furthermore, let’s go on a fruitful journey to know smart ways to solve ‘Coding-Decoding’ questions.
Smart approach to solving ‘Coding-Decoding’ questions
- Observe alphabets or numbers given in the question
- Try to find the pattern or sequence it follows. They could be in ascending or descending order, arranged in an alternate fashion and other ways as well.
- Figure out the rule followed by the given arrangement of alphabets/numbers/words
Basic points you need to remember before solving any question of this topic.
- Alphabets’ positions (A=1, B=2,……,Y=25, Z=26)
- Opposite position of alphabet (A=26, B=25,……, Z=1)
- Opposite of each alphabet (A is opposite to Z, B is opposite to Y and so on)
- Letter coding:
In this type of questions, the alphabets in a word are replaced by other alphabets according to a specific rule.
For instance: In a certain code, “PARKING” is written as “RYTIKLI”. How will FLOWERS be written in that code?
Explanation: Find out the pattern by comparing the 1st letter of PARKING with the 1st letter of RYTIKLI.
We observe that P is converted to R. R is two positions after P.
Now A is converted to Y. So, we can conclude that A is two positions before Y.
So, PARKING is coded as +2 and -2 alphabets in an alternate manner.
Using the same logic, we can decode flowers
F – (+2) – H
L – (-2) – J, as so on
The correct answer is ‘HJQUHPQ’.
In such questions, names/words are substituted with different names/words. We have to carefully trace the substitution to arrive at the correct answer.
For instance: If ‘Parrot’ is known as ‘Peacock’, ‘Peacock’ is known as ‘Swallow’, ‘Swallow’ is known as ‘Pigeon’, ‘Pigeon’ is known as ‘Sparrow’, what would be the name of the national bird?
Explanation: We know ‘peacock’ is the national bird. But in the given question, ‘Peacock’ is coded as ‘Swallow’. So ‘Swallow’ is the correct answer.
- MIXED LETTER CODING:
In this type of question, three-four phrases are given in coded language and the code for a particular word is asked.
To solve such questions, any two phrases with a common word are picked up. The common code word will refer to that word. Proceeding in a similar manner, all possible combinations of two phrases are selected and a common code is picked up.
Let us solve IDBI PO 2012 actual question.
In a certain code language,
- ‘new banking system’means ‘ss tp na’
- ‘officer in uniform’means ‘or mu at’
- ‘new bank officer’means ‘or bk na’
- ‘systems in bank’means ‘bk at ss’
- What is the code for ‘in’?
Explanation: In statements (2) and (4), the common code word is ‘in’ and the common code is ‘at’.
- What does the code ‘bk’ standS for?
Explanation: In statements (3) and (4), the common code word is ‘bk’ and the common word for that is ‘bank’.
- MIXED NUMBER CODING:
In this type of questions, numbers are given corresponding to phrases. Following the same rule as in the above case, we can easily find out the answer. Selecting two phrases at a time, you have to find out the number code for each word and then arrive at the correct answer.
Now let us solve a RBI grade B question.
In a certain code,
‘467’ means ‘leaves are green’,
‘485’ means ‘green is good’
‘639’ means ‘they are paying’.
What is the number code for ‘leaves’?
Explanation: In statements 1 and 3, the common word is ‘green’ and the common number is ‘4’. So, ‘4’ is for ‘green’. Now, in statements 1 and 2, ‘are’ is common and ‘6’is common. So, ‘6’ stands for ‘are’.
In statement 1, only ‘leaves’ and ‘7’ are remaining, therefore ‘leaves’ corresponds to ‘7’.