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Reasoning Ability – Coding-Decoding

Coding-Decoding is a scoring topic in reasoning section. Questions are based on patterns, letter shifts, and logic. Regular practice helps solve them quickly.

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Types of Coding-Decoding

• Letter Coding
• Number Coding
• Alphanumeric Coding
• Pattern Coding

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Basic Concept

Each letter has a position in the alphabet:

A=1, B=2, C=3, ... Z=26

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Important Tricks

1. Letter Shifting

Move letters forward or backward in alphabet.

2. Reverse Position

A=26, B=25, C=24 ... Z=1

3. Pattern Observation

Check difference between letters or numbers.

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Examples

Example 1:
CAT → DBU
(+1 shift)

Example 2:
DOG → FQI
(+2 shift)

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Practice Questions

Q1. If CAT = DBU, then BAT = ?
Answer: CBU

Q2. If DOG = FQI, then SUN = ?
Answer: UWP

Q3. If A=1, B=2, find value of CAB
Answer: 3 + 1 + 2 = 6

Q4. If Z=1, Y=2, find value of ABC
Answer: 26 + 25 + 24 = 75

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Speed Strategy

• Memorize alphabet positions
• Identify pattern quickly
• Avoid overthinking
• Practice regularly

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Practice Task

1. If PEN = QFO, find MAP
2. If BIRD = DJTF, find LION
3. Find value of BAD (A=1 system)

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