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What is true if 9 is a factor?

Updated: 10/17/2024
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11y ago

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The sum of the digits of the number will add to a number that's divisible by nine. For example, 99 -> 9+9 -> 18. 18 is divisible by nine, thus 99 is. Any whole number that's divisible by nine will have its digits add up like this, and any whole number whose digits add up like this will be divisible by nine.

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11y ago
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Q: What is true if 9 is a factor?
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