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  2. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    Stylistic impression of the repeating decimal 0.9999..., representing the digit 9 repeating infinitely. In mathematics, 0.999... (also written as 0. 9, 0.., or 0.(9)) is a repeating decimal that is an alternate way of writing the number 1.