Multiply two odd numbers Add an even and an odd Subtract an odd
and an even
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All of the odd numbers.
They don't ! Adding an odd number to two odd numbers always results in an odd number !
It will always give an even number, as adding any amount of even numbers always results in an even number.
If I understand the question correctly, the sum of two positive numbers will *always* yield a positive number. The product of two positive or two negative numbers will always yield a positive number. The division of two positive or two negative numbers will always yield a positive number. There are more examples along this line. I am not sure if this is what you wanted to know.
If you're talking about multiplication or division, then opposite signs will result in a negative number.