Number Series, Coding and DecodingMCQMTP Sep 24 Series IIQuestion 2156 of 217
All Questions

If A=26\displaystyle A = 26, SUN=27\displaystyle SUN = 27, then CAT = ?

Options

A24
B27
C57
D58
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Correct Answer

✅ Option c — 57

All Options:

  • A24
  • B27
  • C57
  • D58

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Detailed Solution & Explanation

The coding pattern assigns numerical values to letters in the **reverse alphabetical order** (Z=1,Y=2,…,A=26\displaystyle Z=1, Y=2, \dots, A=26).
The reverse position value of a letter is calculated as:
Reverse Value=27−Standard Position Value\text{Reverse Value} = 27 - \text{Standard Position Value}

Let's verify this for **SUN**:
- S=27−19=8\displaystyle \text{S} = 27 - 19 = 8
- U=27−21=6\displaystyle \text{U} = 27 - 21 = 6
- N=27−14=13\displaystyle \text{N} = 27 - 14 = 13
- Sum=8+6+13=27\displaystyle \text{Sum} = 8 + 6 + 13 = 27
This matches the given value of 27\displaystyle 27.

Now, calculate the value for **CAT** using the same reverse alphabetical positions:
- C=27−3=24\displaystyle \text{C} = 27 - 3 = 24
- A=27−1=26\displaystyle \text{A} = 27 - 1 = 26
- T=27−20=7\displaystyle \text{T} = 27 - 20 = 7
- Sum=24+26+7=57\displaystyle \text{Sum} = 24 + 26 + 7 = 57

Hence, **Option C** 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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