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🔤 Chapter 01: Alphabet & Number Test 🔢

Complete Learning Tutorial with Real Examples

1️⃣ Alphabetical Positions (Forward & Backward)

📘 What is this?

Questions based on the position of letters in the English alphabet. Each letter has a specific position from A to Z.

🔤 Letter Positions Reference

📐 Forward Position Formula

Position of Letter = Letter number (A=1… Z=26)

📐 Backward Position Formula

Position from End = 27 − Position from Start

💡 Examples

Example 1: Find position of 'M' from the start

M is the 13th letter.
Answer: 13

Example 2: Find position of 'M' from the end

27 − 13 = 14
Answer: 14

Example 3: Middle letter between A and Z?

Middle = (1 + 26) ÷ 2 = 13.5
So letters are: M(13) and N(14)
Answer: M or N

💡 Pro Tip: Memorize vowels: A(1), E(5), I(9), O(15), U(21).

2️⃣ Letter Shifting & Skipping Patterns

🔄 Type 1: Forward Shifting

Example 1

ABC shifted by +1 = BCD

Example 2

HELLO shifted by +2 = JGNNQ

⬅️ Type 2: Backward Shifting

Example 3

XYZ shifted by −2 = VWX

⏭️ Type 3: Skipping Patterns

Example 4

A, C, E, G, I, ?
Skip 1 each time → K

Example 5

B, D, F, H, J, ?
Even positions → L

💡 Pro Tip: Note differences between letters.

3️⃣ Mixed Alphabet Sequences

↔️ Type 1: Alternating Direction

Example 1

A, B, A, B, A, ? → B

📈 Type 2: Progressive Shift

Example 2

A(+1)=B, B(+2)=D, D(+3)=G, G(+4)=K
Answer: K

Example 3

A, B, D, G, K, ?
Pattern: +1, +2, +3, +4, +5
Next = P

💡 Pro Tip: Check difference pattern.

4️⃣ Number Sequences & Positional Patterns

➕ Type 1: Arithmetic Sequence

Example 1

2, 5, 8, 11, 14 → 17

✖️ Type 2: Geometric Sequence

Example 2

2, 6, 18, 54 → 162

📊 Type 3: Perfect Squares

Example 3

1, 4, 9, 16, 25 → 36

🔢 Type 4: Prime Numbers

Example 4

2, 3, 5, 7, 11, 13 → 17

🎯 Type 5: Fibonacci Sequence

Example 5

1, 1, 2, 3, 5, 8, 13 → 21

⚡ Type 6: Factorial Sequence

Example 6

1, 2, 6, 24, 120 → 720

💡 Pro Tip: Check if sequence is Arithmetic, Geometric, Squares, Primes, Fibonacci.

5️⃣ Alphanumeric Combinations

🔀 Type 1: Position Matching

Example 1

A1, B2, C3, D4 → E5

🔀 Type 2: Alternating Pattern

Example 2

A1, C3, E5, G7 → I9

🔀 Type 3: Progressive Combination

Example 3

1A2, 2B4, 3C6, 4D8 → 5E10

🔀 Type 4: Coded Alphanumeric

Example 4

ABC = 1+2+3 = 6 (or 123)

Example 5

CAT → 3+1+20 = 24
DOG → 4+15+7 = 26

💡 Pro Tip: Solve letters and numbers separately.

🎯 Problem-Solving Strategy

Step-by-Step Approach

1. Identify pattern type

2. Extract key info

3. Test pattern

4. Find missing value

5. Verify

🔍 Complete Example

Series: Z, X, V, T, R, ?

Positions: 26 → 24 → 22 → 20 → 18
Pattern: −2 each time
Next: 18 − 2 = 16 → P

Answer: P

✏️ Practice Questions

Q1

Position of Q?
Answer: 17

Q2

ABC shifted +3?
Answer: DEF

Q3

1, 4, 9, 16, 25, ?
Answer: 36

Q4

A1, B2, C3… What is J?
Answer: J10

Q5

2, 6, 12, 20, 30, ?
Answer: 42

📌 Key Takeaways

• Memorize letter positions

• Backward = 27 − forward

• Identify pattern type

• Check difference/ratio

• Solve letters & numbers separately

• Always verify pattern

• Practice improves speed

© 2025 Logic Reasoning Academy

Chapter 01 Complete Learning Tutorial

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