There are many answers:
if numbers can be repeated-1)all '1s' and all '3s'
2)4'1s' and so on....
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The sum of an odd number of odd numbers will be odd.
The sum of 5 odd number must be odd and so cannot be 50.
No. Sum of odd + odd = even Sum of odd + even = odd Sum of even + even = even
The sum of an odd number and an even number is an odd number.
An odd number of odd numbers can't add up to an even number.