Page 7 – Reasoning (Coding–Decoding)

Problem • Step-wise Solution • Pattern Tricks

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Q1. CAT → DBU, then DOG → ?

Step 1: Observe pattern

C → D (+1)

A → B (+1)

T → U (+1)

Step 2: Apply same to DOG

D → E

O → P

G → H

Answer: EPH

Trick: Check +1 or −1 pattern first

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Q2. BAT → CAU, then PEN → ?

Step 1: Pattern

B → C (+1)

A → A (same)

T → U (+1)

Step 2: Apply to PEN

P → Q

E → E

N → O

Answer: QEO

Trick: Check position-wise changes

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Q3. ABC → BCD, then XYZ → ?

Step 1: Pattern

Each letter +1

Step 2: Apply

X → Y

Y → Z

Z → A

Answer: YZA

Trick: Z goes to A (cycle)

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Q4. 123 → 234, then 567 → ?

Step 1: Pattern

+1 each digit

Step 2: Apply

5 → 6

6 → 7

7 → 8

Answer: 678

Trick: Same logic for numbers

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Q5. CAT → 3120 (C=3, A=1, T=20), then DOG → ?

Step 1: Use alphabet positions

D = 4

O = 15

G = 7

Step 2: Write code

4 15 7

Answer: 4157

Trick: A=1, B=2, C=3…Z=26

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Common Patterns

• +1 / −1 letter shift
• Alphabet position (A=1 to Z=26)
• Reverse order
• Mixed pattern

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Shortcut Approach

Step 1: Check +1 or −1
Step 2: Check alphabet position
Step 3: Check reverse pattern
Step 4: Check mixed logic

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Final Tip

Do not guess → Always find pattern clearly

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