Coding-Decoding Questions for RRB PO, Download Free PDF

In the Reasoning Ability section of the IBPS RRB PO exam, questions on coding-decoding appear frequently. These assess the candidate’s ability to identify a method by which letters, numbers or sentences are transformed into codes (and vice versa). Since these questions are typically less time-consuming and more direct, they offer a good scoring opportunity if approached smartly.

Download Free Coding-Decoding Questions PDF for RRB PO Exam 2025

In this section, we are providing Coding and Decoding questions for RRB PO Exam 2025. These are curated by our experts after analysing previous years’ patterns. Download Now and practice as many questions as you can.

Types of coding-decoding questions in RRB PO

Here are the common formats you will face in the exam (adapted to RRB PO):

1. Letter Coding
   Example: If CAT is coded as DBU, what will DOG be?
   In this case, each letter is shifted by +1 → C→D, A→B, T→U. Hence DOG → EPH.
   Key point: identify the shift (+/–), apply it systematically.
   
2. Number Coding
   Example: If A=1, B=2, … Z=26, what is the code for BANK?
   Here, you convert letters to numbers based on position, or sometimes use arithmetic operations (sum/difference) on these positions.
   
3. Substitution Coding
   Example: If ‘APPLE is RED’ is coded as ‘X Y Z’, then ‘BANANA is YELLOW’ might be coded as ‘P Y Q’.
   Here, words are replaced with symbols/letters. Identify repeated patterns, common words, and link them to codes.
   
4. Mixed Coding / Sentence Coding (Chinese-Style)
   Example:
   “Banks are digital today” → “Lkd Mkd Kkd Tkd”
   “Today banks will change” → “Tkd Lkd Nkd Okd”
   From this, you deduce “banks” = Lkd, “today” = Tkd, etc.
   In RRB PO, you will often see whole sentences transformed into codes—your job is to match word ↔ code by comparing common sentences.
   

Sample practice question set

Here are sample questions you should practise (aim for speed and accuracy):

Letter coding
If ROAD is coded as URDG, then PATH is coded as?
(a) SBUJ  (b) RCUJ  (c) QZSG  (d) None of these
Answer: (a) SBUJ (each letter +1)

Number coding
If A=1, B=2, … Z=26, the code for BANK is:
(a) 2-1-14-11  (b) 3-2-15-12  (c) 2-2-13-10  (d) None of these
Answer: (a) 2-1-14-11

You should prepare many such questions, gradually increasing in difficulty (multi-step shifts, word-code mapping in sentences).

Strategy to solve coding-decoding quickly

Follow this structured approach every time you see such a question:

Step 1: Read the statement carefully

Focus on all given coded sentences or word-code pairs. Note repeated words/codes—they are the key clues.

Step 2: Identify the underlying logic

Check for patterns such as:

• Letter shifting (e.g., +1, −2)
  
• Reversal (e.g., A↔Z, B↔Y)
  
• Number mapping (e.g., A=1, Z=26)
  
• Position changes (e.g., first letter coded by last, etc)
  
• Sentence-based mapping (word to code)
  

Step 3: Apply the logic consistently

Once you think you’ve found the pattern, apply it to all sample statements to verify. If it fails in one case, reconsider the logic.

Step 4: Solve the question

Use the logic and apply it to the target word(s)/code(s). If multiple options are given (MCQ), plug in 1–2 plausible ones for verification. Save time by eliminating wrong options.

Step 5: Skip & return if stuck

In the exam, if a coding-decoding question appears too time-consuming (complex sentence-mapping, multi-step shifts, unknown symbols), skip it temporarily. Return to it only if time permits.

Preparation plan for coding-decoding in RRB PO

• Build the basics: Memorise alphabet positions A=1, B=2 … Z=26. Also recall reverse position logic (Z=1, Y=2 …).
  
• Short-cuts: Practice standard shifts (+1, +2, −1) so they become second nature.
  
• Daily practice: Dedicate about 20 minutes daily solely to coding-decoding questions. Work on at least 15-20 questions per session.
  
• Mock tests: Attempt full-length mock tests under timed conditions. Analyse your performance: time taken, mistakes, skipped questions.
  
• Highlight weak areas: Identify types you struggle with (e.g., sentence-mapping vs. symbol substitution). Practise heavily in those areas.
  
• Mistake analysis: Maintain an error log. For each mistake, note down the logic you missed (e.g., forgot reversal logic, mis-mapped a code, mis-read a repeated word).
  
• Speed enhancement: When practising, time yourself. Gradually reduce the time for each question. In Prelims, try to keep coding-decoding questions within 30-40 seconds each.
  

Final words

In the IBPS RRB PO exam, coding-decoding is a topic you can score easily if you prepare wisely. It’s not about complex calculations; it’s about pattern recognition and application. With consistent practice, the logic in these questions becomes instinctive, and you’ll solve them quickly without hesitation. To solve questions from more such topics, you can buy our test series, where you can reattempt the full-length mock tests and get a Detailed Comparison with the Topper, compare your Time, Score, Accuracy, Correct/Wrong Answers, and even the Average Performance side-by-side. 

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