The sum of any four odd numbers will never be equal to an odd number.
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15, 17, 19 and 21.
23
There are no four odd numbers that will add up to nineteen.
The numbers are -25, -23, -21 and -19.
You cannot add 4 odd NUMBERS to make an odd number, so you have to think constructively...eg 1 + 3 + 15 = 19. There are other similar solutions...