Number Series, Coding and DecodingMCQMTP June 24 Series IQuestion 2194 of 217
All Questions

Find odd man out of the following:

Options

A15\displaystyle 15
B25\displaystyle 25
C37\displaystyle 37
D49\displaystyle 49
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Correct Answer

✅ Option c — 37\displaystyle 37

All Options:

  • A15\displaystyle 15
  • B25\displaystyle 25
  • C37\displaystyle 37
  • D49\displaystyle 49

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Detailed Solution & Explanation

Let's analyze the properties of the numbers 15,25,37,49\displaystyle 15, 25, 37, 49:
- 15\displaystyle 15 is a composite number (15=3×5\displaystyle 15 = 3 \times 5).
- 25\displaystyle 25 is a composite number (25=5×5\displaystyle 25 = 5 \times 5). It is also a perfect square.
- 49\displaystyle 49 is a composite number (49=7×7\displaystyle 49 = 7 \times 7). It is also a perfect square.
- 37\displaystyle 37 is a prime number.

Since 37\displaystyle 37 is the only prime number in the given set (while the others are all composite), it is the odd man out.

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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