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Usually some number will have a recuring decimal, such as one third is 0.333333 and the threes go on forever. If the number is 0.9 and the 9's go on forever there is no practical use in using that number when the difference is so incredibly small that its approximated to 1.

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14y ago

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Q: How is 0.9999999999999999999999 equals to 1?
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