divisibility test of 7
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To find out if a number is divisible by seven, take the last digit, double it, and subtract it from the rest of the number. If you get an answer divisible by 7 (including zero), then the original number is divisible by seven. If you don't know the new number's divisibility, you can apply the rule again.
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Step-by-step explanation:
A number is divisible by 7 if the difference of sums of digits in alternate blocks of 3 digits from right to left is divisible by 7
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