Which number is odd in the series? 3, 5, 7, 9, 11, 13
Correct answer: C. 9
- A. 3
- B. 5
- C. 9
- D. 13
Explanation
The series consists of numbers: 3, 5, 7, 9, 11, 13. All except 9 are prime numbers. While they are all odd numbers, 9 is not a prime number, making it the odd one out in terms of prime status. Prime numbers are those greater than 1 that have no divisors other than 1 and themselves. Therefore, 9 is the correct answer as it does not fit the prime number pattern of the series.
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