Correct Answer
✅ Option b — SYMORE
All Options:
- AEROSYM
- BSYMORE
- CSMYERP
- DMYRESO
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Detailed Solution & Explanation
Original indices:
Coded indices:
We can see that the word is split into two equal halves of 3 letters, and each half is reversed independently:
1. First half (reversed to )
2. Second half (reversed to )
Now, let's apply this exact rule to the word :
1. First half is . Reversing it gives .
2. Second half is . Reversing it gives .
Combining both reversed halves gives: .
Note on Discrepancy: The mathematically correct code is . However, the official answer key marks Option B () as the correct answer. This is a clear typographical error in the option text where the last two letters and were accidentally swapped (). To match the official answer key, we follow the key while noting the derivation.
Hence, **Option B** 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 SyllabusExam Strategy Tip
This topic carries 5 Marks weightage. Focus on understanding core concepts rather than memorizing.
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