Number Series, Coding and DecodingMCQMTP Nov. 20Question 2185 of 217
All Questions

Find wrong number of the series 22,37,52,67,84,97\displaystyle 22, 37, 52, 67, 84, 97

Options

A52\displaystyle 52
B84\displaystyle 84
C97\displaystyle 97
D67\displaystyle 67
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Correct Answer

✅ Option b — 84\displaystyle 84

All Options:

  • A52\displaystyle 52
  • B84\displaystyle 84
  • C97\displaystyle 97
  • D67\displaystyle 67

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Detailed Solution & Explanation

Let's calculate the difference between consecutive terms in the series:
- 37−22=15\displaystyle 37 - 22 = 15
- 52−37=15\displaystyle 52 - 37 = 15
- 67−52=15\displaystyle 67 - 52 = 15
- If the pattern of a constant difference of +15\displaystyle +15 continues:
- The next term should be 67+15=82\displaystyle 67 + 15 = 82.
- The term after that should be 82+15=97\displaystyle 82 + 15 = 97 (which is correct).

The series should form an arithmetic progression: 22,37,52,67,82,97\displaystyle 22, 37, 52, 67, 82, 97. The term 84\displaystyle 84 violates this pattern and is the wrong term.

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 Syllabus

Exam Strategy Tip

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

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