They will always add up to another even number.
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You get an even number
The answer to what is the sum of the first positive even numbers is 930. It doesn't mean that you add all the even numbers up until you reach the number 30. In fact, since you have to get the sum of the even numbers, you have to add all even numbers until you get to the number 60.
No even numbers add up to 9. The sum of even numbers is always an even number.
even
You must add either two odd numbers or two even numbers.