The sum of two whole numbers is odd when one but not both of them is odd.
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The sum of two odd numbers is always even.
The sum of two odd numbers is an even number.
The sum of two odd numbers never makes an odd number. Only the sum of an odd number and an even number makes an odd number.
The sum of two odd numbers is an even number.
Because the sum of two odd numbers is always even and the sum of that even number plus another odd number is always odd.