In a certain code language, 'GATHER' is written as 'DDQKBU'. How will 'SLIDE' be written in that code language?
POFGB
Understanding Coding-Decoding Patterns
Coding-decoding questions test your ability to identify patterns in how words or letters are transformed into a coded form. Once the pattern is found, you apply it to decode or encode another word.
Analyzing the Code: GATHER to DDQKBU
Let's look at the relationship between the letters in the original word 'GATHER' and its coded form 'DDQKBU'. We can find the pattern by looking at the position of each letter in the English alphabet (A=1, B=2, C=3, ...):
| Original Letter | Position | Coded Letter | Position | Change |
|---|---|---|---|---|
| G | 7 | D | 4 | 7 - 3 = 4 (Shift -3) |
| A | 1 | D | 4 | 1 + 3 = 4 (Shift +3) |
| T | 20 | Q | 17 | 20 - 3 = 17 (Shift -3) |
| H | 8 | K | 11 | 8 + 3 = 11 (Shift +3) |
| E | 5 | B | 2 | 5 - 3 = 2 (Shift -3) |
| R | 18 | U | 21 | 18 + 3 = 21 (Shift +3) |
From the table, we can see a clear pattern: the letters are shifted by -3, +3, -3, +3, -3, +3 for the first, second, third, fourth, fifth, and sixth letters respectively.
Applying the Pattern to SLIDE
Now we apply this alternating -3 and +3 shift pattern to the word 'SLIDE'. The pattern for 'SLIDE' (which has 5 letters) will be -3, +3, -3, +3, -3.
| Original Letter | Position | Shift | New Position | Coded Letter |
|---|---|---|---|---|
| S | 19 | -3 | 19 - 3 = 16 | P |
| L | 12 | +3 | 12 + 3 = 15 | O |
| I | 9 | -3 | 9 - 3 = 6 | F |
| D | 4 | +3 | 4 + 3 = 7 | G |
| E | 5 | -3 | 5 - 3 = 2 | B |
Following the pattern, 'SLIDE' is coded as 'POFGB'.
Verifying the SLIDE Code with Options
Let's check the calculated code 'POFGB' against the given options:
- Option 1: POFGB - Matches our result.
- Option 2: VILAB - Does not match.
- Option 3: POFAH - Does not match.
- Option 4: VILAH - Does not match.
The coded word for 'SLIDE' using the identified pattern is indeed 'POFGB'.
Revision Table: Coding Concepts
| Concept | Description |
|---|---|
| Letter Coding | Replacing letters of a word with other letters based on a specific rule or pattern. |
| Position-based Patterns | Patterns based on the alphabetical position of letters (e.g., shifting positions). |
| Mixed Patterns | Using different rules or shifts for different positions or letters in a word. |
Additional Information: Types of Coding-Decoding
Coding-decoding problems can involve various patterns. Some common types include:
- Letter Shifting: Each letter is shifted a fixed number of positions forward or backward in the alphabet.
- Mixed Shifting: The shift amount varies for different letters (like in this problem).
- Reverse Ordering: The letters of the word are simply reversed.
- Letter Replacement: Letters are replaced by specific other letters (not necessarily based on position shift).
- Direct Letter Coding: Each letter in the original word is assigned a specific code letter, which is then directly substituted.
- Number/Symbol Coding: Letters or words are coded using numbers or symbols.
Identifying the correct pattern is key to solving these problems. Practice with different types of patterns will help you recognize them quickly.
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