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Agniveer Army CEE Input-Output

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This page covers Agniveer Army CEE Input-Output with complete concept notes, 6 graded practice MCQs, key points and exam-specific tips. Free to study.

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Concept Notes

Input-Output— Rules & Concept

1.Core Concept

Read this first — the foundation of the topic

Input-Output is a critical reasoning topic where you transform given data through specific rules or patterns. Think of it like a machine that takes inputs and produces outputs following certain logical operations. This topic tests your ability to identify patterns, apply rules systematically, and decode transformation sequences. 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.

2.Key Rules

Core rules you must know cold
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

3.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)

4.Exam Patterns

What examiners ask — read before attempting PYQs

SSC CGL typically asks 2-3 questions from Input-Output. Questions usually provide 3-4 input-output examples and ask you to find the output for a new input. Time allocation should be 60-90 seconds per question.

5.Shortcuts

Use these to save 30–60 seconds per question

#1 - The Difference Method: When dealing with numbers, quickly calculate the difference between input and output for each pair. If differences are same, it's simple addition/subtraction. If differences form a pattern, apply that pattern. Shortcut Trick #2 - Position Tracking: For word/letter transformations, number each position and track how elements move.

Most questions follow simple position-shift patterns.

6.Worked Example

Solve this step-by-step before moving on
1
Step 1

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

2
Step 2

Rule identified = Input - 6 = Output

3
Step 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
Step 1

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

2
Step 2

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

3
Step 3

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

4
Step 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 to Remember

  • 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-Specific Tips

  • 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
Practice MCQs

Input-Output — Practice Questions

6graded MCQs · easy to hard · full solution & trap analysis

All MCQs →
Practice 1easy

A machine processes numbers with the following rule: it multiplies the input by 4, then subtracts 3 from the result. If the output is 29, what was the input?

Practice 2easy

In an input-output machine, when the input is 5, the output is 13. When the input is 8, the output is 22. When the input is 12, the output is 34. What will be the output when the input is 6?

Practice 3medium

A machine takes an input number, multiplies it by 3, adds 5, and then divides the result by 2. If the input is 12, what is the output?

Practice 4medium

In a sequence, each input number is first squared, then decreased by 4, and finally multiplied by 2. If the input is 5, what is the final output?

Practice 5medium

A logical machine processes input as follows: subtract 3 from the number, multiply by 4, then add 7. If the input is 8, what is the output?

Practice 6hard

A machine processes input numbers through the following rules: Step 1 - Multiply the input by 3. Step 2 - Subtract 5 from the result. Step 3 - Divide the result by 2. If the final output is 7, what was the original input?

60-Second Revision — Input-Output

  • 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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