13 is the ratio of 13 to 1 ... nice and rational.
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Any irrational number, when added to 13, will produce an irrational number.
Any irrational number will do.
13 is rational
13 is the ratio of 13 to 1, so it's rational.
There are an infinite number of numbers between 12 and 13. decimals, fractions and irrational numbers