It may be a rational or an irrational number.
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Not necessarily. The sum of two irrational numbers can be rational or irrational.
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.
Yes. The sum of two irrational numbers can be rational, or irrational.
They are always rational.
The sum of two rational numbers is rational.From there, it follows that the sum of a finite set of rational numbers is also rational.