8.09 is the ratio of 809 to 100. Completely rational.
Hint: Any number you can completely write down using digits is rational.
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At least one of the factors has to be irrational.* An irrational number times ANY number (except zero) is irrational. * The product of two irrational numbers can be either rational or irrational.
it is a rational number but 4.121314..... is an irrational no
An irrational number.
It is an irrational number.
Any, and every, irrational number will do.