IBPS RRB Coding Decoding | IBPS RRB Reasoning


Decoding codes take a lot of skill. Most importantly, it needs a clear and logical mind. This is something that the IBPS looks for in future bank employees. That’s the reason why they have included coding-decoding in the IBPS RRB reasoning syllabus. Cracking the code is not as difficult as you might think it is. It just needs a few things. As said before, the first thing that it needs is a clear and logical mind. The second thing that you need to solve the questions is the right approach. And last but not the least, you need a good deal of practice. Here, we would be talking about how you can be solved IBPS RRB Coding Decoding questions in a quick and accurate manner.

Understanding the IBPS RRB Coding Decoding Questions

What are the coding-decoding questions?

Coding questions are quite simple nature. You would be given a coded term and you would need to decode it with the information provided in the question itself.

What is the structure of the questions?

There are a lot of different types of questions asked in IBPS RRB exams on this specific topic. One of the most common types of questions is the one where you are given a un-coded word and its coded version. You are asked to deduce the rules of the ‘code’ and asked to find how another word would be coded by using the same rule.

For example – If in a certain language “NIL” is written as “MOHJKM”, then how will “BOND” be written in that language?
e) None of The Above

How many questions come in the examination?

There is no specific ‘quota’ or a pre-determined number of questions on this topic in the RRB exam. However, if we look at the past year question papers for IBPS RRB prelims, we get the following number of questions:

Average number of questions for IBPS RRB office assistant exam – 5-6 questions

Average number of questions for IBPS RRB PO exam (Scale I) – 5-7 questions

Please note that this information is based on previous year question papers. The number of questions can go up as well as down in IBPS RRB 2021. However, it is safe to say that you can expect at least 4-5 questions from this section in the RRB prelims exam this year. This makes this particular subject crucial to your selection.

How difficult are they to solve?

The IBPS RRB Coding Decoding questions could be said to be of  ‘moderate’ difficulty. Most candidates spend a lot of time understanding the code and then applying it to solve the question. Sometimes, even understanding the code seems to take around 10-15 minutes. This is the reason why a lot of candidates leave the questions or give the wrong answers in a hurry.

Preparing for Solving IBPS RRB Coding Decoding Questions

Solving the questions seem to be very hard and takes a lot of time. Can I do it quickly and accurately?

Of course, you can! The main thing is understanding the way in which words are being coded. Once you get that, the rest becomes easy. To do that quickly and accurately, you need to use the right method and practice well.

How much practice do I need to put in?

When it comes to practicing for IBPS RRB, or any competitive exam for that matter, you need to have a balanced approach. Just because you are finding coding-decoding questions to be tough, that doesn’t mean that you would spend your entire time behind it. We recommend candidates to keep at least 3 days for IBPS RRB reasoning preparation. If you practice for 4 hours for the 3 days, then your total hours per week comes to 12 hours. Since there are a good number of questions from this section, we recommend that you put at least 3 hours behind this from those 12 hours. You can put 1 hour every day or 3 hours on one single day. You should ensure that you are solving at least 30-40 questions every week. This would increase your speed and you would be able to decode much faster.

How Should I Practice?

You don’t have to be James Bond and solve complex codes. So, don’t overdo it. Try to solve questions from previous year IBPS RRB question papers. You could also solve sectional mock tests as that would give you a feel of the questions and also help you to increase the speed and accuracy.

What Books Should I Follow?

There are no specific books for preparing for only coding and decoding questions. Any good book on reasoning would be enough. You can also follow previous year question papers for IBPS RRB prelims.

Methods for Solving IBPS RRB Coding Decoding Questions

Let us look at some of the methods you can use solve some of the most common types of questions on coding decoding questions in IBPS RRB exam. Let us start with the example, that we have cited above.

Question: If in a certain language “NIL” is written as “MOHJKM”, then how will “BOND” be written in that language?
e) None of The Above

Solution: Just start by looking at the two words given first. The first word is ‘NIL’ and ‘MOHJKM’. We need to look at the number of letters. The first word, NIL contains 3 letters and the ‘word’ MOHJKM contains 6 letters. If both the words contained 3 letters each, then we would have looked at the first letters of both the word. They would have constituted our ‘set’. Now, we would have to look at the first letter of NIL, i.e. ‘N’ and the first two letters of ‘MOHJKM’, i.e. ‘M’ and ‘O’.

If we look at the letters, we would find that in the English alphabet, N lies between M and O. Similarly, if we look at other letters, we would find a similar relation exists, as below:

image 1- IBPS RRB coding decoding

So, the word ‘BOND’ would be coded as ‘ACNPMOCE’.

Answer: C

Let us take a look at another example

Question: If “PKROK” is coded as 72962 and KRRPK as “29972”, then how can “QLSAZ” be coded?

a) 45716
b) 74315
c) 91523
d) 51430
e) None of The Above

Solution: Like the example above, we just look at the letters and the numbers for the first word. There are five letters in the first word and correspondingly there are 5 numbers. We just need to write the numbers beside the alphabet, like this:






Similarly, if we look at the second word, we would find that this relation holds true. For example, we have double Rs in the second word. Since R is coded as 9, we should have double 9 in the same position, which we have.

Now, we look at the options. Since the word ‘QLSAZ’  doesn’t have P,R,O or K, the code should not have 7,2,9 or 6. We find that only one option, option (d) fulfills that criteria. That’s the answer!

Answer: D

Let us now look at some practice questions.

Practice Questions

Question 1: If in a certain language, MADRAS is coded as NBESBT, how is BOMBAY coded in that code?


Answer: B

Question 2: In as a certain code, 15789 is written as EGKPT and 2346 is written ALUR. How is 23549 written in that code?



Answer: C

These are some of the ways in which you can solve IBPS RRB coding decoding questions. We hope that this article was of help to you. For more such useful articles, keep browsing our website.

Best wishes!

Team Topprnotes