Number Series, Coding, Odd Man OutPYQ Nov. 18Question 2160 of 217
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Find odd man out of the following 7,9,13,17,19\displaystyle 7, 9, 13, 17, 19.

Options

A7
B9
C19
D13
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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\}:
- 7\displaystyle 7 is a prime number.
- 13\displaystyle 13 is a prime number.
- 17\displaystyle 17 is a prime number.
- 19\displaystyle 19 is a prime number.
- 9\displaystyle 9 is a composite number (9=3×3\displaystyle 9 = 3 \times 3). It is also a perfect square (32\displaystyle 3^2).

Since 9\displaystyle 9 is the only composite number (not a prime) in the set, it is the odd man out.

Hence, **Option B** is the correct answer.

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