if you add a number and its (additive) inverse, you will always get 0.
1 + (-1) = 0
2 + (-2) = 0
3 + (-3) = 0
4 + (-4) = 0
5 + (-5) = 0
and so on....
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sum= answer of an addition question.. so the number of the sum is the answer.
The sum is irrational.
The sum of a single number is itself. So the only number whose sum equals 2 is 2.
Sum of what?
Their sum is real.