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the 7 o'clock isn't exactly equal to 7Sure it is - there's no mathematical difference between 1 and 0.999999...
kevinwparker is right. Here's the proof:1/9 = 0.1111111...9 * (1/9) = 9 * 0.111111...1 = 0.999999...Your brain truncates the digits, which is why it is hard for people to understand this. It is this truncation that later makes you believe you have to "round up."
Here's the Wikipedia page, which was actually a featured article:http://en.wikipedia.org/wiki/0.999...The most interesting part of this article is perhaps the "Skepticism in Education" section.
i feel as though i am uninformed no longer. wow. thanks for the thorough explanations folks!
where can i get one of these? i want one for my precal teacher
you can find it here: http://www.cafepress.com/triplenine.2445706
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