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.
Adding three odd numbers will never equal an even number.
They don't ! Adding an odd number to two odd numbers always results in an odd number !
All multiples of even numbers will equal an even number.
No odd number of odd numbers can sum to an even number.