What Is A Fraction Close To 1?

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Oddman answered
For many engineering problems, within 10% is "close". That would make 9/10 "close to 1." Other times, you want at least 3-digit accuracy, so 9995/10000 would be a better candidate for "close to 1."

What constitutes "close to 1" depends on the application of the number. If it is reliability you are concerned about, and if lives are at stake, you may want reliability on the order of
999999999/1000000000 or better.

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