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Math Help - Geometric Progression

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    Geometric Progression

    Using geometric progression, express 0.4131313... as a fraction.
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    Quote Originally Posted by Punch View Post
    Using geometric progression, express 0.4131313... as a fraction.
    It is the same as 0.4 + 0.0131313.... and you should be able to see a and r for 0.0131313....
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    Quote Originally Posted by mr fantastic View Post
    It is the same as 0.4 + 0.0131313.... and you should be able to see a and r for 0.0131313....
    yes i see that but i dont understand how i could use it
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    Quote Originally Posted by Punch View Post
    yes i see that but i dont understand how i could use it
    Are you saying that you cannot find 0.0131313..... as a fraction and then add it to 0.4 = 4/10?
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    Quote Originally Posted by mr fantastic View Post
    Are you saying that you cannot find 0.0131313..... as a fraction and then add it to 0.4 = 4/10?
    sorry but i dont quite understand how this relates to geometric progression
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    Quote Originally Posted by Punch View Post
    sorry but i dont quite understand how this relates to geometric progression
    If you have been given this question to do you surley must have been shown how to relate an infinite periodic decimal as an infinite geometric series.

    0.0131313... = 0.013 + 0.00013 + 0.0000013 + ..... a and r should be obvious. Go to your class notes or textbook and review the appropriate section of this topic.
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