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Where have you seen a calculator that gives the wrong answer 0.01% of the time?

That would be unheard of.

How about 1 in 9 billion?

https://en.wikipedia.org/wiki/Pentium_FDIV_bug

that's true. instead they (device dependent) butcher calculations by accumulating arbitrarily large numerical error and/or by using binary floating point math, which is so much better... /s

https://en.wikipedia.org/wiki/Round-off_error

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