• saigot@lemmy.ca
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    1 year ago

    27943 - 7*1000 = 20943

    20943 -7*3*1000 = 20943 - 21000 = -57

    -57 is not divisible by 7 therefore 27943 is not divisible by 7.

    • theneverfox
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      1 year ago

      The other posters algorithm was better, but I was exaggerating - ultimately my point is you have to math it out