Number Series, Coding and DecodingMCQMTP May 20, MTP Sep 24 IQuestion 2048 of 217
All Questions

Find missing term of the alphabet series ABD, DGK, HMS, MTB, SBL?

Options

AXKW
BZAB
CZKU
DZKW
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Correct Answer

✅ Option d — ZKW

All Options:

  • AXKW
  • BZAB
  • CZKU
  • DZKW

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Detailed Solution & Explanation

We are given the letter series: ABD, DGK, HMS, MTB, SBL, ?
Let's analyze each letter of the terms by their alphabetical positions:
1. **First Letter:** A, D, H, M, S
- Alphabetical positions: A (1), D (4), H (8), M (13), S (19).
- Differences: +3,+4,+5,+6\displaystyle +3, +4, +5, +6.
- The differences increase by 1\displaystyle 1 each time. The next difference is +7\displaystyle +7.
- The next letter position is 19+7=26\displaystyle 19 + 7 = 26, which is **Z**.
2. **Second Letter:** B, G, M, T, B
- Alphabetical positions: B (2), G (7), M (13), T (20), B (28 or 2).
- Differences: +5,+6,+7,+8\displaystyle +5, +6, +7, +8.
- The differences increase by 1\displaystyle 1 each time. The next difference is +9\displaystyle +9.
- The next letter position is 2+9=11\displaystyle 2 + 9 = 11, which is **K**.
3. **Third Letter:** D, K, S, B, L
- Alphabetical positions: D (4), K (11), S (19), B (28 or 2), L (38 or 12).
- Differences: +7,+8,+9,+10\displaystyle +7, +8, +9, +10.
- The differences increase by 1\displaystyle 1 each time. The next difference is +11\displaystyle +11.
- The next letter position is 12+11=23\displaystyle 12 + 11 = 23, which is **W**.
Combining the components: Z + K + W = **ZKW**.
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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