My brother asked me this question, and I didn't know a definiate answer. I think that it has something to do with the digits go on infinatly (sp?). So, why does this equal 1 instead of 0.99999 ...
These are decimal numbers, and dots above some of the digits make them recurring decimals. One dot means the digit under it repeats infinitely. In other words, it goes on forever (and ever and ever).
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