Because the irrational parts may cancel out.
For example, 1 + sqrt(2) and 5 - sqrt(2) are both irrational but their sum is 1 + 5 = 6.
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Since the sum of two rational numbers is rational, the answer will be the same as for the sum of an irrational and a single rational number. It is always irrational.
They are always rational.
Not necessarily. The sum of two irrational numbers can be rational or irrational.
It may be a rational or an irrational number.
Yes. The sum of two irrational numbers can be rational, or irrational.