Logical Reasoning

Coding-Decoding

Decode encrypted patterns

Coding-Decoding is a vital reasoning topic where a word or number is encoded using a specific rule, and you must decode the pattern to answer questions.

What is Coding-Decoding?

In Coding-Decoding, letters, numbers, or words are replaced or rearranged according to a specific rule or cipher. You must identify the coding pattern from given examples and apply it to decode new items.

Why is it Important?

Coding-Decoding tests pattern recognition and logical thinking. It is a high-scoring topic in banking exams (IBPS, SBI) with 3-5 questions typically appearing in a set.

Key Techniques

Assign position numbers to letters
Check for letter shifting (+1, +2, -1, etc.)
Look for reverse alphabet coding
Identify symbol substitution rules
Check for word rearrangement patterns

Common Patterns

•Letter shift coding (each letter shifted by fixed positions)

•Reverse coding (letters replaced by their reverse alphabet equivalent)

•Conditional coding (different rules for vowels and consonants)

•Number-letter substitution

•Symbol-based coding with operational rules

💡 Pro Tips

1.Write the alphabet with positions for quick reference

2.In set-based questions, find the rule from the first example

3.Practice the EJOTY technique for fast position calculation

📋 Exams Where Asked

IBPS PO/ClerkSBI PO/ClerkSSC CGLRRB NTPCLIC AAONIACL

Frequently Asked Questions

What are the types of Coding-Decoding?

Main types: Letter shifting, number/symbol substitution, conditional coding, and new-pattern coding (where rules are given in the question).

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