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Quick Calculations 2: Divisibility by 7

A proposed rule for divisibility by 7 can be found here.

Is this reliable? Or is there a better way? Or is straight-out dividing the best?

Note by David Lee
2 years, 6 months ago

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So far, this can be considered an efficient method, but is cumbersome with very large numbers, where algebra is required. Nanayaranaraknas Vahdam · 2 years, 6 months ago

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