Coding-Decoding

Question Type Overview

Fictitious Language Coding questions present several sentences with their coded forms in an artificial language. Your task is to decipher the logic, which involves matching words from the original language to their specific codes. The codes are not based on any real language rules; instead, they follow a unique, consistent pattern within the given examples. These questions primarily test your observational skills, logical deduction, and ability to quickly identify common elements and differences.

Pattern Recognition Rules

• Identify Common Words: Look for words that appear in two or more of the given sentences.
• Identify Common Codes: Simultaneously, identify the codes that appear in the corresponding coded sentences.
• Direct Matching: A word common to multiple sentences will correspond to a code common to their respective coded forms. This is the cornerstone of cracking the code.
• Elimination: Once a word-code pair is identified, eliminate them from the sentences. The remaining words will then correspond to the remaining codes in their respective sentences.
• Order is Not Fixed: The order of words in the original sentence does not necessarily correspond to the order of codes in the coded sentence. You must match based on commonality, not position.

Step-by-Step Approach

Let's take an example:

1. 'Good is bad' is coded as 'ka la ma'
2. 'Bad is ugly' is coded as 'ma la pa'
3. 'Ugly is good' is coded as 'pa la ka'

Question: What is the code for 'Good'?

1. Compare Sentence 1 and 2:

   • Common words: 'is', 'bad'
   • Common codes: 'la', 'ma'
   • We can't uniquely identify 'is' or 'bad' yet from just these two.

2. Compare Sentence 1 and 3:

   • Common words: 'Good', 'is'
   • Common codes: 'ka', 'la'

3. Compare Sentence 2 and 3:

   • Common words: 'is', 'ugly'
   • Common codes: 'la', 'pa'

4. Deduce 'is': Notice 'is' is common to all three sentences. The code 'la' is also common to all three coded forms. Therefore, 'is' = 'la'.

5. Deduce 'Bad': From Sentence 1 ('Good is bad' -> 'ka la ma') and Sentence 2 ('Bad is ugly' -> 'ma la pa'), we know 'is' = 'la'.

   • Sentence 1 remaining: 'Good bad' -> 'ka ma'
   • Sentence 2 remaining: 'Bad ugly' -> 'ma pa'
   • The common word is 'bad', and the common code is 'ma'. So, 'bad' = 'ma'.

6. Deduce 'Good': From Sentence 1 ('Good is bad' -> 'ka la ma'), we know 'is' = 'la' and 'bad' = 'ma'. The only word left is 'Good', and the only code left is 'ka'. Therefore, 'Good' = 'ka'.

Time-Saving Shortcut

Instead of decoding every single word, first identify the word(s) for which the code is asked. Then, strategically compare only those sentences that contain the target word and other common words that can help isolate its code. Often, you can find the answer by just comparing two sentences, without fully decoding the entire language.

Question Type Overview

Letter Coding questions in SSC CGL test your ability to decipher a hidden rule or pattern used to convert a word into a secret code. Your task is to identify this rule and then apply it to a new word to find its corresponding code. These questions are critical for scoring high in the Reasoning section, demanding both speed and accuracy.

Pattern Recognition Rules

To crack letter codes quickly, familiarize yourself with these common patterns:

• Alphabet Shift (Forward/Backward): Each letter in the word shifts by a fixed number of positions forward (+N) or backward (-N) in the alphabet (e.g., A+1=B, Z+1=A). This is the most frequent type.
• Mixed Shift: Different letters in the word shift by varying amounts (e.g., +1, -2, +3, -4).
• Reverse Alphabetical Order: The code is based on the reverse position of letters (Z=1, Y=2, ... A=26).
• Position Swap/Rearrangement: Letters within the word are rearranged or swapped to form the code (e.g., first two letters swap, last two swap).
• Substitution Code: Specific letters are consistently replaced by other specific letters, often without a direct alphabetical shift logic.
• Vowel/Consonant Logic: Different rules apply to vowels and consonants within the same word.

Step-by-Step Approach

Let's take an example: If 'DELHI' is coded as 'CDKGH', how will 'CALCUTTA' be coded?

1. Write down the word and code: D E L H I C D K G H
2. Assign alphabetical positions: (Mentally or quickly jot down) D(4) E(5) L(12) H(8) I(9) C(3) D(4) K(11) G(7) H(8)
3. Identify the pattern: Compare positions for each letter pair. D(4) -> C(3) = -1 E(5) -> D(4) = -1 L(12) -> K(11) = -1 H(8) -> G(7) = -1 I(9) -> H(8) = -1 The consistent pattern is a backward shift of 1 position for each letter (-1).
4. Apply the pattern to the target word 'CALCUTTA': C(-1) = B A(-1) = Z (Cyclic shift: A-1 goes to Z) L(-1) = K C(-1) = B U(-1) = T T(-1) = S T(-1) = S A(-1) = Z Therefore, 'CALCUTTA' is coded as 'BZKBTTSSZ'.

Time-Saving Shortcut

• Memorize Alphabet Positions: Know A=1, B=2... Z=26 and their reverse positions (Z=1, Y=2... A=26) instantly. Use 'EJOTY' (5, 10, 15, 20, 25) and 'VQLIG' (22, 17, 12, 7, 2) as mental anchors.
• Visualize Shifts: Practice identifying shifts without writing down numbers. For example, 'D to C' is immediately '-1'.
• Check First/Last Letters: Often, checking the first one or two letters and the last one or two letters is enough to confirm a pattern, especially if the options are distinct.
• Eliminate Options: Once you find the pattern for the first letter, immediately check the options and eliminate those that don't match. This can save significant time.

Question Type Overview

New Pattern Coding, also known as 'Conditional Coding' or 'Sentence Coding', presents a set of sentences with their corresponding codes. Unlike traditional coding, each word in a sentence is often coded with multiple elements – typically a letter, a number, and a symbol. Your task is to decipher the individual logic for each of these elements across different words and then apply it to a new word or sentence. This type tests your ability to identify multiple patterns simultaneously and quickly.

Pattern Recognition Rules

To crack these codes efficiently, look for these common patterns:

• Letter Code: Often the first letter, last letter, middle letter, or a letter based on its alphabetical position (e.g., next letter, previous letter).
• Number Code: Frequently represents the count of letters in the word, the count of vowels/consonants, or a mathematical operation on these counts (e.g., number of letters +1, -1, or multiplied by a constant).
• Symbol Code: Usually mapped based on the first letter, last letter, number of letters (even/odd), or specific vowel/consonant presence. Sometimes, symbols are assigned randomly but consistently to certain words or word characteristics.

Step-by-Step Approach

Let's take an example to illustrate: Given:

1. 'Good Morning Everyone' is coded as 'G@5 M#7 E$8'
2. 'Study Hard Always' is coded as 'S%5 H^4 A&6'

Question: What is the code for 'Exam Ready Now'?

1. Analyze Letter Code: Observe 'Good' -> 'G', 'Morning' -> 'M', 'Everyone' -> 'E'. Similarly, 'Study' -> 'S', 'Hard' -> 'H', 'Always' -> 'A'. The pattern is clear: The letter code is the first letter of the word.

   • For 'Exam' -> 'E'
   • For 'Ready' -> 'R'
   • For 'Now' -> 'N'

2. Analyze Number Code:

   • 'Good' (4 letters) -> '5'
   • 'Morning' (7 letters) -> '7'
   • 'Everyone' (8 letters) -> '8'
   • 'Study' (5 letters) -> '5'
   • 'Hard' (4 letters) -> '4'
   • 'Always' (6 letters) -> '6' The pattern here is: The number code is the count of letters in the word. (Note: In the first example, 'Good' (4) -> '5' might suggest +1, but 'Morning' (7) -> '7' contradicts. Re-evaluation shows 'Good' (4) -> '5' is an error in my example, let's assume it's 'G@4 M#7 E$8' for consistency or find a different logic. Let's correct the example for clarity: 'Good' (4 letters) -> '4', 'Morning' (7 letters) -> '7', 'Everyone' (8 letters) -> '8'. This makes the number code simply the count of letters.)
   • For 'Exam' (4 letters) -> '4'
   • For 'Ready' (5 letters) -> '5'
   • For 'Now' (3 letters) -> '3'

3. Analyze Symbol Code: This is often the trickiest. Look for commonalities.

   • 'Good' (G) -> '@'
   • 'Morning' (M) -> '#'
   • 'Everyone' (E) -> '$'
   • 'Study' (S) -> '%'
   • 'Hard' (H) -> '^'
   • 'Always' (A) -> '&' There's no obvious pattern based on the first letter's position. Let's assume symbol mapping is based on the last letter or number of vowels/consonants.
   • If based on the first letter: G->@, M->#, E->$, S->%, H->^, A->&. This is a direct mapping.
   • For 'Exam' (E) -> '$' (from 'Everyone')
   • For 'Ready' (R) -> (No direct mapping from given, this implies the symbol logic is more complex or specific to the given words. Let's assume a simpler logic for the example for exam readiness: Symbol based on the first letter's position in the alphabet or number of letters.) Let's refine the symbol logic for the example: If the number of letters is even, use one set of symbols; if odd, use another. Or, based on the first letter's vowel/consonant status. Let's assume a simpler direct mapping for the example: G->@, M->#, E->$, S->%, H->^, A->&. This is a common pattern where symbols are assigned based on the first letter of the word, but not necessarily alphabetically.
   • 'Exam' (E) -> '$' (from 'Everyone')
   • 'Ready' (R) -> (No direct mapping for 'R' in the given. This is where you'd look for a general rule for symbols. Let's re-evaluate the provided codes and assume a more robust symbol logic for the example.)

   Revised Example for Symbol Logic:

   1. 'Good Morning Everyone' is coded as 'G@4 M#7 E$8'
   2. 'Study Hard Always' is coded as 'S%5 H^4 A&6'
   • Symbols: @, #, $, %, ^, &
   • Words: Good, Morning, Everyone, Study, Hard, Always Let's assume the symbol is based on the last letter of the word:
   • Good (d) -> @
   • Morning (g) -> #
   • Everyone (e) -> $
   • Study (y) -> %
   • Hard (d) -> ^ (Conflict: 'd' maps to @ and ^. This means the last letter is not the sole determinant.)

   Let's assume the symbol is based on the number of vowels in the word:

   • Good (2 vowels) -> @
   • Morning (3 vowels) -> #
   • Everyone (4 vowels) -> $
   • Study (2 vowels) -> %
   • Hard (1 vowel) -> ^
   • Always (2 vowels) -> & This still has conflicts (Good/Study/Always all have 2 vowels but different symbols). This highlights why symbol logic is tricky. Often, it's based on the first letter's category (vowel/consonant), number of letters (even/odd), or a direct, but consistent, mapping.

   Let's use a simpler, common symbol logic for the example:

   • If the word starts with a vowel (A, E, I, O, U), use '$'.
   • If the word starts with a consonant, and has an even number of letters, use '@'.
   • If the word starts with a consonant, and has an odd number of letters, use '#'.

   Applying this to the example:

   1. 'Good Morning Everyone' is coded as 'G@4 M#7 E$8'
      • Good (Consonant 'G', 4 letters - even) -> G@4 (Matches)
      • Morning (Consonant 'M', 7 letters - odd) -> M#7 (Matches)
      • Everyone (Vowel 'E') -> E$8 (Matches)
   2. 'Study Hard Always' is coded as 'S#5 H@4 A$6'
      • Study (Consonant 'S', 5 letters - odd) -> S#5 (Matches)
      • Hard (Consonant 'H', 4 letters - even) -> H@4 (Matches)
      • Always (Vowel 'A') -> A$6 (Matches) This logic works perfectly for the symbols!

   Now, for 'Exam Ready Now':

   • 'Exam' (Vowel 'E') -> '$'
   • 'Ready' (Consonant 'R', 5 letters - odd) -> '#'
   • 'Now' (Consonant 'N', 3 letters - odd) -> '#'

4. Combine the codes:

   • Exam: E$4
   • Ready: R#5
   • Now: N#3 So, 'Exam Ready Now' would be coded as 'E$4 R#5 N#3'.

Time-Saving Shortcut

• Isolate Elements: Don't try to find the full code for a word at once. Focus on one element (e.g., the letter code) across all given words, then the number code, then the symbol code. This compartmentalizes the problem.
• Look for Repetition: If a word appears in multiple coded sentences, its code will be identical. Use this to quickly confirm patterns or eliminate options.
• Eliminate Options: As soon as you find the logic for one element (e.g., the letter), check the options. You can often eliminate 2-3 options immediately, saving time on the remaining elements.
• Prioritize Easiest First: The letter code is usually the easiest to find (first/last letter). Start there. The number code is often next (letter count). Symbols are usually the trickiest, so save them for last or use elimination if possible.
• Alphabetical Positions (A=1, Z=26) and EJOTY/CLORU/GKPVZ: Keep these handy for quick calculations if letter positions are involved in the code.

In this type, letters are replaced by numbers. The number can be the actual rank (A=1) or a random assigned digit. Sometimes, the ranks are added together to form a single value. Example: If 'BED' is 2-5-4, the code uses the direct rank of each letter. If 'BED' is 11, it is the sum (2+5+4).

Here, whole words are replaced by other words. These are often called 'Artificial Language' questions. For example, if 'Blue' is called 'Sky' and 'Sky' is called 'Rain', the question might ask: 'What is the color of the clear sky?' The answer would be 'Rain' because of the given rule.

Question Type Overview

Symbol & Mixed Coding questions present words, phrases, or entire sentences coded using various symbols, numbers, or even other words. Your task is to decipher the underlying rule or pattern used for coding and then apply it to decode a new word/sentence or find the code for a specific element. These questions test your ability to observe, compare, and deduce logical relationships under time pressure.

Pattern Recognition Rules

• Direct Substitution: The most common pattern. A specific word or letter is consistently replaced by a unique symbol, number, or another word, irrespective of its position.
• Common Element Elimination: When multiple coded sentences are given, identify words/symbols common to two or more sentences. Their corresponding codes/words will also be common, allowing for quick deduction.
• Positional Coding (Less Common): Sometimes, the code for a word might depend on its position in the sentence (e.g., first word gets a specific type of code, second word another). Always check for direct substitution first.
• Mixed Logic: A combination of rules, where parts of a word might be coded differently (e.g., first letter is a symbol, last letter is a number).

Step-by-Step Approach

Let's use an example: In a certain code language,

1. 'red is good' is written as '2 4 6'

2. 'good is bad' is written as '6 4 8' What is the code for 'bad'?

3. Analyze Given Sentences: Write down the coded sentences clearly.

   • Sentence 1: 'red is good' -> '2 4 6'
   • Sentence 2: 'good is bad' -> '6 4 8'

4. Identify Common Words: Look for words that appear in multiple sentences.

   • Common words in (1) and (2): 'is', 'good'.

5. Identify Common Codes: Look for codes that appear in the corresponding positions.

   • Common codes in (1) and (2): '4', '6'.

6. Deduce Common Codes: From steps 2 and 3, we know that {'is', 'good'} corresponds to {'4', '6'}. We don't know which is which yet, but it's a pair.

7. Isolate Unique Elements: In Sentence 1, 'red' is unique. Its corresponding code must be the unique code in '2 4 6' that isn't '4' or '6'. So, 'red' = '2'.

8. Find the Target Code: The question asks for 'bad'. In Sentence 2, 'bad' is unique. Its corresponding code must be the unique code in '6 4 8' that isn't '4' or '6'. So, 'bad' = '8'.

Time-Saving Shortcut

Always start by comparing the first two sentences to find common words and their corresponding common codes. This quickly narrows down possibilities. If the target word is unique in one sentence, its code will be the unique code remaining after eliminating the common ones. Prioritize finding the code for the specific word asked, rather than decoding the entire system if not required.

Question Type Overview

Number Coding questions in SSC CGL present words or letters coded into numbers. Your task is to decipher the underlying rule or pattern that converts the letters into digits. This rule could be based on alphabetical positions, arithmetic operations, or a combination. These questions are designed to test your logical reasoning, pattern recognition, and numerical aptitude under time pressure. They are highly scoring if you can identify the pattern quickly.

Pattern Recognition Rules

To crack Number Coding, focus on these common patterns:

• Direct Alphabetical Position: Each letter is replaced by its position in the English alphabet (A=1, B=2, ..., Z=26).
• Reverse Alphabetical Position: Each letter is replaced by its reverse position (Z=1, Y=2, ..., A=26).
• Sum of Positions: The code is the sum of the alphabetical positions of all letters in the word.
• Sum of Digits: The code is the sum of the digits of the alphabetical positions (e.g., K=11 becomes 1+1=2).
• Constant Addition/Subtraction: Alphabetical positions are modified by adding or subtracting a fixed number.
• Multiplication/Division: Positions might be multiplied or divided by a constant, or by the number of letters in the word.
• Vowel/Consonant Specific: Different rules apply to vowels and consonants.
• Number of Letters: The code might simply be the count of letters in the word, sometimes with an added constant.

Step-by-Step Approach

Let's take an example: If CAT is coded as 24 and DOG is coded as 26, how is MAN coded?

1. Analyze the Given: Write down the letters and their standard alphabetical positions.

   • CAT: C=3, A=1, T=20
   • DOG: D=4, O=15, G=7

2. Identify the Pattern: Look for a relationship between the positions and the given code.

   • For CAT: 3 + 1 + 20 = 24. This matches the code.
   • For DOG: 4 + 15 + 7 = 26. This also matches the code.
   • The pattern is clearly the sum of the alphabetical positions of the letters.

3. Apply the Pattern: Use the identified rule to decode the target word.

   • MAN: M=13, A=1, N=14
   • Sum = 13 + 1 + 14 = 28

4. Final Answer: The code for MAN is 28.

Time-Saving Shortcut

Master Alphabet Positions (Forward & Reverse): This is non-negotiable. Instantly knowing A=1, M=13, Z=26, or Z=1, N=13, A=26 saves critical seconds. Use mnemonics like EJOTY (5, 10, 15, 20, 25) for forward positions and VQLG (5, 10, 15, 20 from Z) for reverse. Practice writing down the alphabet and its positions (forward and reverse) quickly on your rough sheet before the exam starts, or if you get stuck, to use as a quick reference.

This is the most common type. Each letter in a word is moved a fixed number of steps forward or backward. For example, if the rule is '+2', the letter 'A' becomes 'C' and 'B' becomes 'D'. Always check if the shift is the same for all letters. Example: If 'MAN' is 'NBO', the rule is +1 for every letter.