Yes.
No, it is rational.
It is rational. It is rational. It is rational. It is rational.
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"Rational" is an adjective and so there cannot be "a rational" (and certainly not "an rational"). Any answer would depend on whether the question was about a rational number, a rational person, a rational argument or "a rational" combined with some other noun.
It is rational.
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Rational
1.14 is rational.
4.6 is rational.
No, it is rational.
It is a rational number
It is rational. It is rational. It is rational. It is rational.
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It is: 1
No, it is rational.
Rational.
It is rational