Your corrected version is below. The main fixes are:

• Removed incorrect or ambiguous examples.
• Corrected repeating block patterns.
• Fixed the symbol sequence (keyboard symbols are not a standard reasoning rule).
• Improved explanations to match competitive exams (SSC, Bank, UPSC CSAT, CAT, etc.).

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1. Alphabetical Skip-Step Sequences

Idea

Finding the next letter by observing fixed or changing skips in the alphabet.

Rule

Count the gap between consecutive letters. The gap may be constant or increase/decrease regularly.

Example 1

Problem: Find the next letter.

A, D, G, J, M, ?

Solution

Step 1: Letter positions

A = 1
D = 4
G = 7
J = 10
M = 13

Step 2:

+3
+3
+3
+3

Step 3:

13 + 3 = 16

16 = P

Answer: P

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Example 2

Problem

A, C, F, J, O, ?

Solution

A→C = +2
C→F = +3
F→J = +4
J→O = +5

Next jump

+6

O(15)+6=21=U

Answer: U

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Example 3

Problem

Z, V, R, N, ?

Solution

-4
-4
-4

N(14)-4=10

10 = J

Answer: J

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2. Repeating Block Patterns

Idea

A fixed block repeats continuously.

Rule

Identify the repeating unit and continue it.

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Example 1

Problem

A B C A B C A B ?

Solution

Repeating block

ABC
ABC
ABC

Missing letter

C

Answer: C

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Example 2

Problem

X Y Z X Y Z X ?

Repeating block

XYZ

Next letter

Y

Answer: Y

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Example 3

Problem

P Q R S
P Q R S
P Q ?

Repeating block

PQRS

Missing letters

R S

Answer: R, S

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3. Symbol Rotation & Reflection Series

Idea

Each figure rotates or reflects by a fixed angle.

Rule

Observe whether every figure rotates clockwise, anticlockwise, or flips.

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Example 1

↑ → ↓ ← ?

Every arrow rotates

90° clockwise

Next

↑

Answer: Up

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Example 2

North
Northeast
East
?

Each rotation

45° clockwise

Next

Southeast

Answer: Southeast

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4. Reverse Alphabetical Ordering

Idea

Letters move backward through the alphabet.

Rule

Convert letters into positions and subtract the required amount.

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Example 1

Z, W, T, Q, N, ?

26
23
20
17
14

Difference

−3

Next

11 = K

Answer: K

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Example 2

Z, X, V, T, R, ?

Difference

−2

Next

16 = P

Answer: P

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Example 3

A, Z, B, Y, C, X, ?

Split into two patterns

Forward

A
B
C
D

Backward

Z
Y
X
W

Next (7th term)

D

Answer: D

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5. Missing & Wrong Character Puzzles

Idea

Find the missing or incorrect letter by identifying the pattern.

Rule

Determine the pattern first, then locate the anomaly.

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Example 1

A, C, ?, G, I

Pattern

+2

Missing

E

Answer: E

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Example 2

A, C, E, H, I, K

Expected pattern

A C E G I K

Wrong letter

H

Should be

G

Answer: H

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Example 3

B, D, G, K, P, ?

Differences

+2
+3
+4
+5

Next

+6

P(16)+6=22

22 = V

Answer: V

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6. Alphabet Position Puzzles

Idea

Use alphabetical positions with wrap-around after Z.

Rule

If the value exceeds 26, subtract 26.

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Example 1

X, A, D, G, ?

+3

X→A (wrap)
A→D
D→G

Next

J

Answer: J

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Example 2

Z, C, F, I, ?

+3

I→L

Answer: L

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Example 3

A, C, I, ?

Positions

1
3
9

Pattern

×3

9×3=27

Wrap

27−26=1

1 = A

Answer: A

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7. Mixed Number–Letter Series

Idea

Letters and numbers follow independent patterns.

Rule

Solve the number sequence and letter sequence separately, then combine.

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Example 1

A1, B2, C3, D4, ?

Letters

A
B
C
D
E

Numbers

1
2
3
4
5

Answer: E5

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Example 2

2A, 4B, 6C, 8D, ?

Numbers

+2

Letters

+1

Next

10E

Answer: 10E

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Example 3

A2, C4, E6, G8, ?

Letters

+2

Numbers

+2

Next

I10

Answer: I10

Note: Avoid using arbitrary symbol progressions such as #, $, %, &, ? in reasoning examples unless the question explicitly defines the symbol order. Standard aptitude exams generally use letters, numbers, or predefined symbol mappings rather than assumed keyboard sequences.