If you write it in decimal, it will continue indefinitely, without a regular repeating pattern.
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No. 81 is a rational number. An irrational number is a number with an endless amount of digits like pi or the square root of 2.
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.
Yes. The square root of any number that is not a perfect square (like 9 or 36) is irrational.
it is a rational number but 4.121314..... is an irrational no
An irrational number.