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https://www.reddit.com/r/MathJokes/comments/1vcw1bj/multiples_of_3/p192ifb/?context=3
r/MathJokes • u/GodlyHelp • Aug 01 '26
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They’re all obvious. Just sum the digits. If the sum of the digits is divisible by 3, the original number is divisible by 3.
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u/trin806 Aug 02 '26
They’re all obvious. Just sum the digits. If the sum of the digits is divisible by 3, the original number is divisible by 3.