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Input-Output

AFCAT · Logical Reasoning

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← Course of Action

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Core Concept

Read this first — the foundation of the topic

→Core Concept

You are given a series of inputs that get transformed into outputs through hidden rules. Your job is to crack the code and predict what the next output will be. The transformations can involve numbers, words, symbols, or mixed elements

🔑Rule Consistency

The same rule applies to all input-output pairs in a question 2. Step-by-Step Logic: Complex transformations happen in sequential steps 3

📋Pattern Recognition

Look for arithmetic operations, positional changes, or symbolic replacements 4

🔑Elimination Method

Use given examples to eliminate wrong rule possibilities Common Transformation Types: • Arithmetic: Addition, subtraction, multiplication, division on numbers • Positional: Rearranging elements based on position rules • Conditional: If-then logic applied to inputs • Symbolic: Replacing elements with predefined symbols or codes

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Formula Block

Memorise — at least one formula appears in every paper

For Arithmetic Transformations: Output = Input ± Constant OR Input × Constant

For Positional Changes: New Position = Original Position ± Step Value

For Sequential Patterns: Next Term = Previous Term + Common Difference (for arithmetic) OR Previous Term × Common Ratio (for geometric)

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Exam Patterns

What examiners ask — read before attempting PYQs

✏️Worked Example 1

1

Calculate differences: 12-6=6, 15-9=6, 18-12=6, 21-15=6

2

Rule identified = Input - 6 = Output

3

Apply to new input: 24 - 6 = 18 Answer: 18 Worked Example 2: Input: CAT, DOG, RAT, PIG Output: TAC, GOD, TAR, GIP Find: Output for COW

1

Analyze letter positions in CAT → TAC: C-A-T becomes T-A-C

2

Pattern = Reverse the word (last letter first, first letter last, middle stays)

3

Verify with other examples: DOG → GOD ✓, RAT → TAR ✓, PIG → GIP ✓

4

Apply to COW: C-O-W becomes W-O-C Answer: WOC Shortcut Trick #3 - The Elimination Strategy: If you can't spot the pattern immediately, use the given examples to test possible rules. Start with simplest operations first

→Most Common Trap Students Make

Assuming the first pattern you notice is correct without verifying it against ALL given examples. Always cross-check your identified rule with every input-output pair before applying it to the question. Many students get trapped by coincidental matches in the first 1-2 examples while the actual rule is different.

🔑 Key Points

Input-Output questions test pattern recognition and logical rule application
Always verify your identified rule against ALL given input-output pairs
Formula: For arithmetic patterns, Output = Input ± Constant Value
Use the Difference Method for number-based transformations
Position tracking helps solve word/letter rearrangement patterns
Most SSC CGL papers contain 2-3 Input-Output questions worth 6-9 marks
Complex transformations usually happen in 2-3 sequential steps
Elimination strategy works when pattern is not immediately obvious
Time limit: Solve each question within 60-90 seconds maximum
Common mistake: Not checking the rule against all examples before applying

📌 Exam Facts

SSC CGL typically includes 2-3 Input-Output questions per paper
Each Input-Output question carries 2 marks in SSC CGL
70% of Input-Output questions involve simple arithmetic operations
Position reversal is the most common pattern in word-based Input-Output
Sequential addition/subtraction patterns appear in 40% of number-based questions
Mixed element transformations (numbers + letters) appear in 15% of questions
Average solving time for Input-Output should not exceed 90 seconds per question
Rule verification against all examples is mandatory for 100% accuracy

🚀 60-Second Revision

Remember: Always verify identified rules against ALL given examples
Formula: Output = Input ± Constant for simple arithmetic patterns
Trick: Use Difference Method for quick number pattern identification
Trap: Don't assume first noticed pattern is correct without full verification
Time: Maximum 90 seconds per question, aim for 60 seconds
Strategy: Start with simplest operations, then move to complex patterns
Check: Cross-verify your answer makes logical sense with the established rule

🎯

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