The sum of an odd number of odd numbers will be odd.
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All the numbers in that range that end with 1, 3, 5, 7, or 9.
An odd number of odd numbers can't add up to an even number.
The answer is 105 because 3,5, and 7 are all prime factors and when you multiply the numbers together it comes out to be 105 witch is lower than 160 and is an odd number.
Yes, the factors of all odd numbers are odd numbers.
45, 63, 81, 99, 117