Which one is the odd one out in the series: 1, 3, 5, 7, 9?
- 1
- 3
- 7
- 9
Explanation
Identify the properties of each number
1 is neither prime nor composite.
3 is a prime number.
5 is a prime number.
7 is a prime number.
9 is a composite number since 9 = 3 x 3.
The odd one out in the series is 9.
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