Number Series, Coding and DecodingPYQ Jan 26Question 4218 of 217
All Questions

Which of the followings is odd one?

Options

ACEHL
BKMPT
COQTX
DNPSV
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Correct Answer

✅ Option d — NPSV

All Options:

  • ACEHL
  • BKMPT
  • COQTX
  • DNPSV

Detailed Solution & Explanation

Let us analyze the position of each letter in the alphabetical order (where A = 1, B = 2, C = 3, ..., Z = 26) to find the pattern of differences between consecutive letters in each option:

- **Option a: CEHL**
- C = 3
- E = 5 (difference: 5−3=+2\displaystyle 5 - 3 = +2)
- H = 8 (difference: 8−5=+3\displaystyle 8 - 5 = +3)
- L = 12 (difference: 12−8=+4\displaystyle 12 - 8 = +4)
- Pattern of differences: +2,+3,+4\displaystyle +2, +3, +4

- **Option b: KMPT**
- K = 11
- M = 13 (difference: 13−11=+2\displaystyle 13 - 11 = +2)
- P = 16 (difference: 16−13=+3\displaystyle 16 - 13 = +3)
- T = 20 (difference: 20−16=+4\displaystyle 20 - 16 = +4)
- Pattern of differences: +2,+3,+4\displaystyle +2, +3, +4

- **Option c: OQTX**
- O = 15
- Q = 17 (difference: 17−15=+2\displaystyle 17 - 15 = +2)
- T = 20 (difference: 20−17=+3\displaystyle 20 - 17 = +3)
- X = 24 (difference: 24−20=+4\displaystyle 24 - 20 = +4)
- Pattern of differences: +2,+3,+4\displaystyle +2, +3, +4

- **Option d: NPSV**
- N = 14
- P = 16 (difference: 16−14=+2\displaystyle 16 - 14 = +2)
- S = 19 (difference: 19−16=+3\displaystyle 19 - 16 = +3)
- V = 22 (difference: 22−19=+3\displaystyle 22 - 19 = +3)
- Pattern of differences: +2,+3,+3\displaystyle +2, +3, +3

Options a, b, and c follow the same pattern of differences of +2,+3,+4\displaystyle +2, +3, +4 between successive letters. Option d does not follow this pattern (its differences are +2,+3,+3\displaystyle +2, +3, +3). Hence, NPSV is the odd one.

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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