which is an irrational number

Question

ivancsc1996 · Answer

Is a number that makes no sense :) No I am kidding. An irrational number is one that has an infinite number of decimal places such as pi and therefore it can't be written as a fraction.

anonymous · Answer

I think u should post this up on the math section and youll get more help( if u want :)   )

saifoo.khan · Answer

Try posting here: http://openstudy.com/study#/groups/Mathematics

anonymous · Answer

An irrational number is a number that has an infinite number of decimal places AND no sort of pattern to them. Examples would be pi or the natural number e.

A number can have infinite decimal places, but still be rational if the decimals replace. An example of this would be 4/9 or 0.444...(repeating). You could also have something like 3.45454545...

I believe the precise difference between rational and irrational numbers is that rational numbers can be expressed in terms of a fraction, while irrational numbers can only be approximated by a fraction. (Though I'm not too certain on this point.)

vincent-lyon.fr · Answer

1/3 has an infinte number of decimals BUT it is a rational number.

A rational number can be expressed as p/q where p and q are integers.

$\sqrt 2$ is irrational.

Of course $e$ and $\pi$ are irrational too, but they are more than that, they are Transcendental numbers: numbers that cannot be expressed as the root of a polynomial equation with integer coefficients.