5 odd numbers must always equal an odd number so can never equal 1000
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No odd number of odd numbers can sum to an even number.
The numbers are 11, 13, 15, 17 and 19.
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
19
1 + 1 + 1 + 1 + 5 + 5 = 14