Number Series, Coding and DecodingMCQPYQ Dec 21Question 2097 of 217
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In a certain code "THANKS" is written as " SKNHTA" then how is "STUPID" written?

Options

ADIPUTS
BDIPUUT
CDIPUST
DDIPSTU
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Correct Answer

✅ Option d — DIPSTU

All Options:

  • ADIPUTS
  • BDIPUUT
  • CDIPUST
  • DDIPSTU

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Detailed Solution & Explanation

To find how the word **STUPID** is written based on the coding of **THANKS** as **SKNHTA** (or **SKNTHA**):

Let us first analyze the letter arrangement and identify a minor typographical error in the question statement:
- If we split **THANKS** into two halves:
- First half: T H A\displaystyle T\ H\ A
- Second half: N K S\displaystyle N\ K\ S
- In the code, the second half is completely reversed: N K S→S K N\displaystyle N\ K\ S \to S\ K\ N.
- The first half T H A\displaystyle T\ H\ A is written as H T A\displaystyle H\ T\ A in the code due to a typo. The intended code was **SKNTHA**, where the first half T H A\displaystyle T\ H\ A is kept in its original order.

This confirms the **Half-Reverse Rule**:
1. Split the word into two equal halves.
2. Reverse the second half.
3. Keep the first half in its original order (or place it after the reversed second half).

Let us apply this exact rule to the word **STUPID**:
- Split the word into two halves:
- First half: S T U\displaystyle S\ T\ U
- Second half: P I D\displaystyle P\ I\ D
- Reverse the second half:
P I D→D I PP\ I\ D \to \mathbf{D\ I\ P}
- Keep the first half in its original order:
S T U\mathbf{S\ T\ U}
- Combine the reversed second half and the original first half:
DIPSTU\mathbf{DIPSTU}

Hence, **Option D** is the correct answer.

About This Chapter: Number Series, Coding and Decoding

Paper

Paper 3: Quantitative Aptitude

Weightage

5 Marks

Key Topics

Number series, Coding & Decoding, Odd man out

This chapter covers Number series, Coding & Decoding, Odd man out and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.

View Official ICAI Syllabus

Exam Strategy Tip

This topic carries 5 Marks weightage. Focus on understanding core concepts rather than memorizing.

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