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Math Help - Irrational numbers

  1. #1
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    Irrational numbers

    Hi, I'm doing homework and there are a few problems I don't understand at all.

    re: different types of numbers:

    [4] would e/e be irrational since e is irrational or would it be a natural number since e divided by itself would just I guess be 1?

    [5] 2.121121112 would be irrational I guess since the number is not completely repeating but changes?

    thanks so much in advance for the help!!
    Last edited by mr fantastic; September 17th 2011 at 01:10 PM. Reason: MOved to new thread.
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  2. #2
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    Re: Irrational numbers

    e/e=1 so its a rational number.

    in the second case, you have just given some finite sequence, so I would say its a rational number again. Irrational numbers don't have finite sequence after the decimal point.......
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  3. #3
    Grand Panjandrum
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    Re: Irrational numbers

    Quote Originally Posted by Katrina0754 View Post

    [5] 2.121121112 would be irrational I guess since the number is not completely repeating but changes?

    thanks so much in advance for the help!!
    If this is supposed to represent a non-terminating decimal with sequences of 1's of increasing length between 2s then yes this is irrational. The decimal expansion of very rational eventually terminates or becomes periodic.

    CB
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