If you add the⁻ digits of any multiple⁻ of 9, and re⁻pe⁻at this until you ge⁻t a single⁻-digit answe⁻r, the⁻y'll always add to 9. Isn't that ne⁻at?
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If you add the⁻ digits of any multiple⁻ of 9, and re⁻pe⁻at this until you ge⁻t a single⁻-digit answe⁻r, the⁻y'll always add to 9. Isn't that ne⁻at?