🔐 What is Coding-Decoding? — Types Overview
Coding-Decoding is a reasoning topic where a word or number is encoded (converted) using a systematic rule, and you must either find the code for a given word or decode a given code back to its original form. The key insight is that the same rule applies to every letter or word — once you crack the pattern on the first example, you can apply it to any new word.
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| B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | A |
CAT is coded as DBU (+1). What is DOG coded as?
The type of coding where A↔Z, B↔Y is called coding. It uses a mirror mapping where position p encodes to position 27−p.
In word substitution coding, if BOOK means TABLE and TABLE means CHAIR, then what do we read from? (We read from a BOOK. In the code, BOOK means TABLE — so the answer is TABLE.)
Q1In a coding language, CAT is coded as DBU. What system is being used?
Q2If APPLE is coded as EPPLA, what type of coding is this?
Q3"If BOOK means TABLE, TABLE means CHAIR, CHAIR means BENCH" — what type of coding is this?
↻ Letter Shift Coding — +1, +2 Forward & Backward
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↔ Reverse Alphabet Coding — A↔Z Mirror
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# Number Coding — A=1 / A=26 / Position Formulas
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💬 Word & Sentence Substitution Coding
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⊞ Matrix/Grid & New Pattern Coding (SSC 2023+)
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⚡ Mixed Patterns, Combinations & Exam Shortcuts
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