Never.
When you dont add the same odd number and even number of times.
For example:
5 + 3 (2 odd numbers; and even amount of odd numbers ) = 8
5 + 3 + 7 = 15 an odd amount of odd numbers
5 + 3 + 7 + 9 = 24 another even amount of odd numbers.
But never if you use the only same number
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3 odd numbers can't be equal to 50 because: odd number + odd number = even number even number + odd number = odd number thus, adding 3 odd numbers will always give a sum which is an odd number too even number.
They don't ! Adding an odd number to two odd numbers always results in an odd number !
Adding three odd numbers will never equal an even number.
All multiples of even numbers will equal an even number.
No odd number of odd numbers can sum to an even number.