asking that question is like asking how we know what 2 plus 2 there is no answer
Yes, there is an answer.
To add even numbers is to add sets of two. When you add sets of two, you will always come up with another set of two. Addition of even numbers does not divide the set in two in half, which would result in an odd answer.
In Algebra, ax + bx = (b+c)x. If x is two, then we have the addition of even numbers. The result, we see, is divisible by x-two-and thus be an even number.
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No even numbers add up to 9. The sum of even numbers is always an even number.
They will always add up to another even number.
numbers are infinite! If you can find a number, you can always add 1 to it and carry on. The numbers we don't even have a name!!
No, they do not. If one of the prime numbers is 2, you will have an odd number.
When you add them, you always get an even number; when you multiply them, the result is always odd.