Answer:
One number has to be odd and the other even.
Explanation:
For example, if the first number is 11. If I add two additional odd number like 11 and 11, my final answer would be 33 which is odd number.
If I added two even number to 11 like 10 and 10, my answer would be 31 which is an odd number.
If I added a odd and a negative number to 11 like 11 and 10, my answer would be 32 which is even.
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