SSC CGL Verbal Reasoning: Coding & Decoding Tricks

Why Coding‑Decoding Matters in SSC CGL Reasoning

Ever felt like a secret message is hiding in a question? That's exactly what coding‑decoding questions do – they turn ordinary words or numbers into a puzzle you have to crack.

💡 In Simple Words: Coding‑decoding is like a secret handshake. You learn the rule that changes A to D, 1 to 4, etc., then use that rule to read or write the hidden message.

What Is Coding‑Decoding?

In reasoning, “coding” means converting a given word or number into a new form using a rule. “Decoding” is the reverse – you start with the coded version and figure out the original.

Typical rules include shifting letters forward or backward, swapping positions, adding or subtracting a fixed number, or mixing letters and numbers.

Common Types of Codes

• Letter shift: each letter moves a fixed number of places in the alphabet (A → D is a +3 shift).
• Reverse order: the sequence is read backwards.
• Digit manipulation: add, subtract or multiply each digit.
• Mix & match: combine two or more simple rules.

Step‑by‑Step Trick (Flowchart)

How to Solve Coding‑Decoding Questions for SSC CGL

Follow these five practical steps. They work for most of the questions you’ll see in the exam.

1. Identify the given pair. Look at the example the question provides – usually a word and its coded form.
2. Detect the transformation. Ask yourself: Is each letter moved forward? Is the order reversed? Is a number added?
3. Formulate the rule. Write it down in plain English, like “Add 2 to each digit” or “Replace every vowel with the next consonant”.
4. Test the rule. Apply it to another element in the pair (if two examples are given) to be sure you didn’t miss a hidden step.
5. Use the rule on the answer choices. Encode or decode each option and see which one matches the target.

Worked Example 1 – Letter Shift

Question: If “MANGO” is coded as “PDQJR”, how will “APPLE” be coded?

Solution:

1. Write the alphabets with numbers: A=1, B=2 … Z=26.
2. Compare M (13) → P (16). The jump is +3. Check the next letter: A (1) → D (4), also +3. So the rule is “Shift each letter three places forward”.
3. Apply +3 to APPLE:

• A → D
• P → S
• P → S
• L → O
• E → H

Answer: DSSOH.

Worked Example 2 – Digit Manipulation

Question: 246 is coded as 135. What is the code for 579?

Solution:

1. Look at the change: 2→1 (‑1), 4→3 (‑1), 6→5 (‑1). So each digit is reduced by 1.
2. Apply –1 to 579: 5→4, 7→6, 9→8.
3. Code is 468.

Worked Example 3 – Mixed Rule

Question: “CAT” → “EBV”. Find the code for “DOG”.

Solution:

1. Check C→E (+2), A→B (+1), T→V (+2). Not uniform, so maybe two steps: first shift +2, then change the middle letter by +1.
2. Try rule: “Shift first and last letters +2, middle letter +1”.
3. Apply to DOG:

• D (+2) → F
• O (+1) → P
• G (+2) → I

Quick Reference Table

Tips & Tricks to Save Time

• Always write down the alphabet with numbers – it speeds up shift calculations.
• Check for wrap‑around (Z + 1 becomes A). It’s a common trap.
• If two examples are given, compare both to confirm the rule.
• When numbers are involved, think of simple arithmetic before jumping to complex formulas.
• Practice a few standard patterns daily; muscle memory cuts seconds off your answer time.

📝 Likely Exam Questions

1. Question: “BIRD” is coded as “DJTF”. How will “FISH” be coded?
   Answer: Shift each letter +2 → “HJUK”.
2. Question: 809 is coded as 718. What is the code for 432?
   Answer: Each digit –1 → 321.
3. Question: “SUN” → “UWO”. Find the code for “MOON”.
   Answer: Shift +2 for each letter → “OQQP”.
4. Question: If “1234” becomes “4321”, what does “5678” become?
   Answer: Reverse order → “8765”.
5. Question: “GEEK” → “IEMI”. What is the code for “CODE”?
   Answer: Shift first & last +2, middle +1 → “EQFG”.