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How can you use 4 9's to make 23?

Updated: 8/17/2019
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Wiki User

14y ago

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It is impossible to make 23 from four 9's unless modular arithmetic is involved, in this case in mod 40, 57, 58, 59, 76, 697, 6538. I personally can't see any other way to obtain 23 other than modular arithmetic.

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14y ago
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Q: How can you use 4 9's to make 23?
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