Divisibilitymedium
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To test divisibility by , we can repeatedly remove the last digit, double it, and subtract from the remaining number. If the result is divisible by , so is the original. Using this rule, which numbers are divisible by ?
To test divisibility by , we can repeatedly remove the last digit, double it, and subtract from the remaining number. If the result is divisible by , so is the original. Using this rule, which numbers are divisible by ?