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/sci/ - Science & Math

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>> No.12326363 [View]
File: 70 KB, 720x540, naughty number 9.jpg [View same] [iqdb] [saucenao] [google]
12326363

I was watching pic related out of nostalgia the other day, and the penny product principle interested me. The penny product being numbers divisible by 9 have individual digits whose sum are also factors of 9. Is there any writing that details why this is?

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