Find odd man out of the following $7, 9, 13, 17, 19$.
Select Your Answer (Keyboard: A, B, C, D)
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Number Series, Coding and DecodingMCQPYQ Nov. 18Question 2160 of 217
All Questions Correct Answer
✅ Option b — 9
All Options:
- A7
- B9
- C19
- D13
Detailed Solution & Explanation
Let's analyze the numbers in the set \{7, 9, 13, 17, 19\}:
- is a prime number.
- $13\displaystyle is a prime number.<br>- $17 is a prime number.
- $199$ is a composite number ($9 = 3 3$). It is also a perfect square ($3^29$ is the only composite number (not a prime) in the set, it is the odd man out.
Hence, **Option B** is the correct answer.
- is a prime number.
- $13\displaystyle is a prime number.<br>- $17 is a prime number.
- $199$ is a composite number ($9 = 3 3$). It is also a perfect square ($3^29$ is the only composite number (not a prime) in the set, it is the odd man out.
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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